Thanks again Migaku for sponsoring this video! Migaku is offering a 50% discount on their Lifetime subscription, along with an additional free month on Standard and Early Access subscriptions: migaku.com/CantoMando
You got a wrong answer for 1/6 * 24 ÷ 64 (2/3+1/6) here how it should be :- 1/6 * 24 ÷ 64 (4/6 + 1/6) 1/6 * 24 ÷ 64 (5/6) 1/6 * 24 ÷ 64*5/6 4 ÷ 64 * 5/6 (4/64)*5/6 1/16*5/6 5/96 for more where ever you get (÷ x) it simply means (*1/x) just by replacing it clears confusion in order to not to get two answer
Thank you, @CantoMando, for the fascinating experiment. Among many other things, it underscores the cultural differences between Chinese and Western thinking. With due respect to Sheldon, the Chinese system is superior, despite each having its pros and cons. The Western approach resembles the English language, where letters represent sounds, while the Chinese method uses characters that convey meaning directly. In English, you write one letter/aphabet at a time and then mentally process the word's meaning after completing writing it. In contrast, Chinese characters (pictograms or idograms) act as pictures that immediately represent their meanings directly. In short, Chinese is more efficient, smarter and speedier. This contrast is evident in how each approach problem-solving. Sheldon follows an apparently systematic workflow to solve problems, while XianXian seems to grasp the answer instantly through a quicker, more fluid yet comprehensive mental process. This analogy extends to Western chess and Chinese weiqi: in Western chess, players advance step by step toward checkmate, whereas in weiqi, players simultaneously consider the overall strategy and individual moves, viewing victory as a holistic outcome. Today, in 2025, the Chinese have a significant advantage due to a more complete and holistic system that incorporates/integrates both methodologies, such as through embedding hanyu pinyin within Chinese characters. 😄😃😀
This isn't a test of who is smarter though, it's a test on understanding of certain material and the problems were handpicked for the kid. This video would feel less like clickbait if the problems were vector addition and calculus.
@@duckymomo7935 yeah but if we were learning real analysis and group theory back in elementary school then I would have already got the nobel prize by now lol
showing working is literally to show the logic/method you used to arrive at your answer, except showing working is specifically the mathematical method.
it is showing your work, they’re practically just using first order logic apply some additional definitions and theorems without having to actually write a proof for it
everyone can use logic when they are taught about logic , The boy already knew how to solve the problem that's why he solved it quickly give him a new problem which he never solved then see what happens .
Not necessarily only those from tsinghua but those from most top schools in China are also very competitive. It's insane. They are taught not just to memorise but to understand which is why it is amazing.
my history teacher got a bachelors and masters at peking, then a masters at harvard, then taught at harvard, then co-wrote the chinese textbook we use for our schools chinese curriculum 💀💀
I had friend in middle school who was from China and he said he was the worst student in his class so his parents sent him to the United States to live with his aunt and at our school he was a top student.😂
woahh its sad how the worst students there come out to be top somewhere else, they aren't really bad just in a wrong competition, but it does make them feel useless or not fitting into the society
man u dont even have to convince anyone I'm in hs and I barely do my work yet I'm in top 5 because I "barely" do my work whereas my classmates *do not* even do their work
yeah and its the opposite case for me, I was the top student in my middle school and when we went back to China, I was only in the middle of the class while doing my best.
20:12 actually after Xianxian get into middle school and high school, he'll probably use the same methods like Sheldon. Xianxian used elementary school competition math here, being the top student of his class, there's no way he dont participate in math competitions (things like Mathematical Olympiad), where u solve problems with very limited tools, therefore u have to rely on logic, mechanisms and tricks. In the end when we finish college education, we all solve problems like Sheldon, math becomes boring then unless u do research with the newest tools. Math is always more interesting when u feel your tools are limited for the problem
Chinese people here. This knowledge is actually taught in extracurricular competition classes in primary school, but as an ordinary kid who has never attended those classes, there’s no way I can solve these problems. 🤣
in Chinese we call it a "mental thinking" which is how different a person approaches an answer or just its unique way of thinking. (thinking outside the box)
I'm not Chinese but I did use this approach with the rabbit and chicken problem. When I saw the way the older guy solved it, I immediately chuckled because that was the way I was also taught in American schools (more systematic/formulaic approach). However, solving these problems by thinking it in your head makes it a more fun mental challenge.
That's how someone would think with very limited math tools (no equations etc.). That's how I did things before but felt like it was "cheating" because all the answers were so thorough and looked much more rigorous so I gave up on it and forgot with time lol. It's so much easier to just bruteforce everything with equations anyway.
Fun Fact: The Final question is the question that led to the invention of calculus. Greeks trying to understand circles and their properties led to the discovery of concepts like imaginary numbers, and that started a chain of discoveries that would end up with calculus.
@Chun350 Not exactly. It's a very long process that found it's origins in tbe Greeks as I said. Basically the. Trying to understand concepts like imaginary numbers is what snowballed into full blown calculus.
Translations and continuation of science is not a weird thing, natural science is always about test until it reaches law status; and then newtonian but at plank length and black hole scope quantum mechanics takes over. So yeah im not gonna spoil the tl section from the light novel then
Had a lot of fun filming this one. Want to highlight a couple points: - was really fascinating to see the difference in ways of thinking. I look back and almost overcomplicated everything, and it's interesting to see that my brain went straight to formulas while that kid had a more simple approach. I think that way of thinking really was etched into me in University and I probably would have just thought about the problem from a non formulaic angle prior to engineering school 🤔 no way is right or wrong - it's just interesting to see how university influenced me to go straight to one default way of looking at problems. 2) btw let's appreciate how impressive that kid was. I don't think I would have solved it with the way I was going. I took 10 minutes to think of that last question and he went to go hang out with his mom and sister in the back 😂😂😂
We are taught formulas because they are fair and universal. They can be applied to chicken heads or rocket parts. Formulas are just a way of writing down the logic. I am sure that if you were alone, and had time to think without social pressure, you would have done it. My university is ranked below yours and I had no problem even after graduating 9 years ago, stop making Waterloo look bad 😂 you'll drag down their ranking😉
Formulas are fine. They're generic ways to solve problems. Sure you can apply other techniques like that chicken and rabbit problem. But, that's just another technique (or formula) that's less generic than expressing it as a simultaneous equation. With the minimum perimeter/area question, I knew it'd be a circle because that's why many things naturally form spheres in life (e.g. water droplets minimizing surface area), but I would have double checked my intuition by writing out all the areas as well. With the circle question, which was terribly worded, using formulas would have done the same thing once you recognize that the length of the rectangle is half the circumference. The kid was familiar with the concept of slicing a circle into a rectangle (often seen in deriving the area of a circle assuming you know the diameter) so he was able to use that to intuitively answer it. Intuitive shortcuts are cool but they're specialized at solving a particular type of question. What's impressive from the kid is that he's familiar with all these shortcuts and was able to apply it all within seconds in his head.
QUICK CLARIFICATION on question 8 - this question was taken out of a Chinese school book and upon editing I realized it was completely lost in translation. In all three cases the moon should appear so the really question made no sense- SORRY GUYS!!!
@@evanhsiehYeah, I was gonna say… I guess it’s good Sheldon failed the last question because that means the 5th grader would have still won even counting the errors
@@tichu7 Idk if this is a reference to a song or whatever but if you are being legit, in a solar eclipse the moon is still present it’s just not illuminated by the sun
Sheldon you are so good with kids and such a great sport! That kid is so bright and gracious too! Smart and impeccable manners! He is very smart but was so humble when he won- he was so gracious and he looked like he was about to cry when they handed him the 100 red pocket. Aww 😊
18:20 That is actually taught in middle school. You don't realize how much basic knowledge you have forgotten until you see it again in elementary or middle school textbooks.
idk why the engineer guy took so long,but you can literally see the thing,the part I think schools are failing is that they don't make children logical,they don't get the essence of reasoning
@@shadowyt376 I'm not sure where you are from but I'm from New Zealand and in my school they emphasize on teaching where how the formulas are derived rather than giving you the formula.
@@porkchop7605 well its not the same all over the world thats what i am saying. im from india btw and apparently what they teach in most schools is not even enough to pass the grade.
For that question I still don't get it. When each piece is cut won't the ends be curved like a pizza slice? So how do they form a rectangle when put together? I think im missing something?!
Chinese education is tough man, I went to a school in china for a year and literally almost failed, another thing that makes it extremely hard, is the language, speaking it is easy, but writing and reading are hard af🙏😭
i studied mandarin for four years but bruh, it was hell for me. speaking, reading, and writing drove me nuts. i couldn't even remember how i passed the class.
@@GetCookedByHyxkorean and chinese education is both difficult both will get u send to mental asylum there’s no competition their schedule timetable is almost the same
as a Chinese child, It is very difficult for us in school especially if your mother expects alot from you. and it very difficult to be consistent with your grade :((
Last question also shows how the area of a circle was derived. My gradeschool teacher (bless her soul) told a story of its origin instead of just giving out formulas and calling it a day. Main reason I really liked math since then.
not me feeling proud of myself that i understood the kid's explanation for the last question after not even being able to solve it myself at first when i tried. but it was an amazing way to look at that question, he's a genius!!
sheldon did very well. that kid is top of his class, which means he does a lot of math olympiad questions, which are questions like the ones we saw. the boy is well trained.
Not really trained, the kid is just smart and uses simple (untrained raw intelligence) original thinking to solve problems. When you grow older, absorb so much knowledge and get trained, you will lose this capability. Of course, both are very smart. It's easier to use formulas, which implies lots of training, but lack of original thinking.
@@BX8UWT nah, if he gets training in math olympiad questions, he's used to questions that requires out of the box thinking. that already gives him an advantage. the questions are taken from chinese textbooks so i won't be surprised if he's seen some of the questions before. this said, i'm not saying he's not smart, he is obviously very smart.
@@BX8UWT First of all, not trained is just false, the kid lives and breathes school which Id argue is incredibly unhealthy. Second, the kid did not do any original thinking this video, he clearly already knew all the olympiad problems and was trained on what tricks you would need to solve it, I once got a problem solving interview question, but I already knew the problem so it was incredibly easy to make myself seem like a brilliant problem solver. Thirdly, formulas are just tools, but figuring out how to apply them requires original thinking, notice how Sheldon at the end figured out the steps to solve the problem after the solution was revealed. Finally, giving kids puzzles and making them problem solve is brilliant, but every day 6 am to 10 pm is pointless and absurd, likely when you get to university or get a job you will never solve a single olympiad math problem ever again.
Those math questions bring back trauma from when I was a kid in China. You need math Olympiad training to get into good middle schools. And almost all of these questions are standard questions for 3 graders. I was considered a shit student back then so that was some fun time.
you need to learn to think which is a skill (trainable/learnable) starting in preschool - preschool and primary schools are the most important for mental development
@@firstlast-pt5pp yes, math Olympiad trains you to think. However, in that system, if you aren’t good at certain things (such as intense math Olympiad and poem reciting) that the school system wants you to be, you (an 8 years old) are a pile of horseshit. The system could, in Chinese saying, “kill a lot of buds in its infancy.” I am grateful that my parents saw how unhealthy that was, packed up, and took me to the US. I went to an elite Chinese school in Beijing. It even had some crazy entrance exam for 5 and 6 year olds. And back then that was the best education one could receive there. But all that being said, math Olympiad is probably optional. I’m pretty confident now I’m good at learning. I got a PhD last year for one. And I started teaching at a university in NY for another. Sorry if this is too long. I saw math Olympiad questions and trauma kicked into my door and said hello to me.
@@dianew2007 - maths is just a platform to facilitate thinking lessons - that's why in the video the kid was asked to tell us his thought processes - if just an answer is required, just ask google/Alexa ( or ai ) - Einstein used his brain to imagine and think not storing information that can be retrieved externally ( ai today for example)
@@firstlast-pt5ppI think we are talking about two different things, but yes I agree with your opinion. What I was talking about is the extreme side of forcing kids to go through the ruthless system of you have to do math Olympiad or you fail that was prevalent in China 10-20 years ago, not sure about now. Like I said-it’s traumatic. Like your teachers would tell you in your face that “you are trash” kind of traumatic. Or “you think you’re good at school work now? girls are dumber than boys, and boys will catch up and be smarter than you” kind of traumatic. And yes that was what I was told back then in elementary school, which is what you mentioned as the most important phase of education.
I believe the question at 10:21 is incorrect, the correct answer should be 5/96. This is because the 64(2/3+1/6) counts as multiplication and is not included in the brackets, so you would move left to right in order of operations. Then you get: 4/64 (5/6) = 1/16 (5/6) = 5/96
The correct order is 1. Whatever that’s inside the bracket. 2. Multiplication denoted by bracket 3. Left to right multi/division. So you need to multiply 64 x 5/6 first.
Well to be fair, the further up you go the more specialized you become in Math. You start focusing on very specific areas and equations while getting weaker in another.
Nah bro he's just weak as fck, like come on this is literraly questions for 7th-8th graders. And even if you don't think so I doubt an engineer would ever struggle with the last question. He doesn't understand sht about math. The answer is even explanable by this little kid... and your statement is like saying that we forget what's 2+2 the more we focus on specific areas of math... this is unbelievable
let me explain the last question as i found the answer by myself, we know that opposite sides of rectangle are equal so here the catch, divide the circle into two equal pieces now the width of rectangle will be 5 units, {if you are not getting my point try to visualise this by dividing a circle into two parts expand it like a rectangle you will see that the radius will be the width no matter what} so the perimeter of circle will be 10pie or 31.4 units now let l be length of rectnagle so area of circle = area of rectangle ie,25pie=5l or l =15.7 and permiter of rect, =2{15.7+5}=41.4 now they askedd how much long will be the rectangle form circle so subtract the circle circumference from rectangle there you that 10.
which is not a Chinese thing, we don't hang leader's photo in classrooms or any places, the only place mao's picture is showed is the tiananmen square and on our currency.
15:39 The question is not phrased properly. According to this question, the answer is: 5pi - 10 The question they meant to ask was this: Given that the diameter of the circle is 10, how much longer will the *rectangle's perimeter* be from the *circle's perimeter*? Then yes, the answer is 10.
@@cja12345: We don't have enough information to know. But he's a HELL of a lot smarter at MATH than the VAST majority of American students in 5th grade in public school systems. And I'd guess something over 99 percent seems about right.
They do a ton of logic puzzles that stretch their knowledge to their limits, so our fifth grader may not know calculus or what nitrogen is, he can do brain twisters like the circle problem no problem
I got a score of 26 which while isn’t horrendous, it’s CRAZY how much smarter both Sheldon and the boy are! For context I’m a 3rd year CS major with a 3.3GPA (was a 3.5 last semester but I ate a bad grade Fall 2024)
I'm a 2nd year robot operator and my GPA is close to 4 although its around 3.9 GPA. I'm not asian and I'm not good at math for one thing. I guess I'm just a chill guy but they pay me scholarship and i never felt like I worked hard for it.
11:03 Wait a minute, you can always see a part of the Moon during partial eclipses (either Lunar or Solar). During total solar eclipses, the Moon is in front of the Sun and hides it. During total lunar eclipses, the Moon is behind the Earth which blocks the sun rays and so the Moon appears dark red through gamma rays (best answer in my opinion). The only time a Moon might not be visible would be if it’s hidden by an object in the sky or maybe during a new Moon phase when it lays between the Sun and the Earth.
Well for the last question, we somewhat studied the same logic also, basically cut a particular radius of a circle and extend them horizontally it then created a straight line (arcs) after that we apply the arcs formula to get the areas of different shapes
10:21 The answer is 5/96 There's a common misconception about parenthesis, it's true that we have to do whatever the operation is "INSIDE" the bracket first, but when we are done, we treat the bracket as a simple multiplication and don't give it priority. After every operation INSIDE the bracket is done, the bracket becomes multiplication and we move left to right doing the operations Edit: For People Asking for solution 1/6 × 24 ÷ 64 ( 2/3 + 1/6 ) Do the bracket 1/6 × 24 ÷ 64 ( 5/6) This can be written as 1/6 × 24 ÷ 64 × 5/6 Go from Left to Right = 4 ÷ 64 × 5/6 = 1/16 × 5/6 = 5/96 For reference I used Wolfram Alpha to cross check and bprp's yt video on order of operations. Edit 2: I directly claim the ans is 5/96 cuz I have proof. Try to put out your beliefs or atleast don't provide baseless accusations.
You have parenthesis tho at the (5/6) meaning you have to multiply 64(5/6) first. Its weird that you applied the right rule for the 1/6 × 24 and you didn't apply the same thing with 64(5/6). Try reading about PEMDAS rule.
Can someone clarify the moon question? Depending on the location, if your within the partial eclipse event, you should still see the moon. That's what makes it partial.
The solution to the math problem in minute 10 it’s not 3/40 but it’s 5/96. When you have multiplication and division you have to follow the order from left to right.
No way you sound so cocky and are still wrong, you definitely failed 2nd grade maths, there are different order of operation rules around the world that give different solutions to same expressions and all of them are right. Using BODMAS, 1/6 × 24 ÷ 64(2/3 + 1/6) =1/6 × 24 ÷ 64(4/6 + 1/6) =1/6 × 24 ÷ 64(5/6) =1/6 × 24 ÷ 320/6 =4 ÷ 320/6 =4 × 6/320 =24/320 =3/40
@@Nohomosapien maybe you forgot that division and multiplication starts from left lmao 1/6 × 24 ÷ 64(2/3 + 1/6) =1/6 × 24 ÷ 64(5/6) =4 ÷ 64(5/6) =(1/16)(5/6) =(1.5)/(16.6) =5/96 you are tiring me with this instead of learning primary school math
These questions are easy for him as a primary school student, but difficult for me as a college student (Chinese education is really effective but tiring)
14:20 This is a fun problem. I did R=4 and C=2. 4x10 = 40 (finding the most legs possible) 40 - 32 = 8 (finding how many legs over 32 I have) 8 / 2 = 4 (finding the chickens I need to reduce the total down to 32) thus C = 4, R = 6 (6*4 + 4*2 = 24 + 8 = 32)
On the last question, my understanding of the answer is this: think of the circle like a pizza and the rectangle like all the pizza slices lined up together with the crusts facing the outside. Kind of like a mouth full of sharp teeth that is closed. The question is how much longer is the overall perimeter of the rectangle shape than the circumference of the pizza. We also know that the pizza is ten inches wide, which means that every slice is five inches long. If you think about it, the only difference between the circle pizza and rectangle arrangement is that the length of a slice of pizza is exposed on the right and left side. Since we know the length of a pizza slice is 5 inches and there are two exposed sides, the difference in length is 5+5, or 10.
15:43 This is just nitpicking btw, but I can’t be the only one who misinterpreted “length” in the last question to be the difference in their horizontal lengths (length of the rectangle minus the diameter of the circle, which would have given a value closest to 6), instead of the difference in their perimeters. I was so confused when the answer was 10.😂
Haha that's what I thought! Difference in length is not the same as difference in the perimeter which is what the question said. I can understand the chinese child getting that because of language but yeh that answer I got 5pie-10 fairly quickly. But I learnt that in year 9. No way would I have gotten that in year 5 or even year 8!
For that question I still don't get it. When each piece is cut won't the ends be curved like a pizza slice? So how do they form a rectangle when put together? I think im missing something?!
@@albertchen247 The "rectangle" is an approximation. To be precise, the resulting shape is some shape with curvy edges, and you want to compare its perimeter against that of the original circle.
Yes. You are correct, will be curvy and hard to calculate. However, the thinner the slice you cut the circle, the straighter the curved edges will be. Imagine if you cut it into infinitely thin slices, the curved edge will appear to flattened out and more and more appropriate a rectangle when you combine the slices. @@albertchen247
That last question really wasn't worded properly, it tripped me up until 16:16 clarified that by "length" it was actually referring to perimeter (I missed the clarification until re-watching), 'cause otherwise... if it were solving for length where length is L in L*W=10π, W->r, r=10/2=5, L=5π, so the rectangle would be 5π-10 longer than the circle which is π/2 times longer or roughly 1.5707
Actually, I think Sheldon gave the right answer for the first intermediate question of 5 marks because moon is partially visible during the partial eclipse
the question at 10:02 is wrong, the correct answer is 5/96 using standard Order of Operations with places equal priority on multiplication and division. if you don't believe me paste this (1/6)*24/64*(2/3+1/6) into google and then multiply the answer by 96
I thought that too and these types of questions always annoy me. Like if it's in parentheses then should we multiply first or divide what should be divided first. There are so many systems anyways, BODMAS, PEMDAS etc etc and each tells us to do different things. It's so so annoying bruh...
@@Warsorcerer2510 if parentheses are being multipled or divided you still read from left to right, if you do distributive property like how they did, you have to distribute the entire equation. So you need to distribute ((1/6)*24 / 64) to (2/3 + 1/6), they messed up by only distrubuting the 64 into the parenthesis.
As an 18 year old student in Ireland this is quite surprising, I would say any of my friends would be solving all these questions with ease, especially that last one
I think maybe something got lost in translation, or the kid misunderstood the question, but the host didn't want to make things awkward. Should have just been very clear from the start. I solved it as the actual length of the rectangle versus the diameter of the circle, in which case it is 5pi-10, which is close to 5.7
As someone whose been told they’re “gifted” basically their entire life this video gave me a major case of imposter syndrome, I guess the geniuses in china are just built different 😂
The mom at the back 👽😴🥱🤑🤑🤑🤑🤑🤑🤑🤑😮💨😮💨😮💨😮💨😮💨 Edit fun fact in china there is a test and the bottom 50 percent will not get a job so everyone wants to learn a lot so they can get a job
Guys, I don't understand the circle problem at 15:40 . The question is talking about the length of rectangle. So, the length would be circumference ÷ 2 because the circle is cut into triangular slices which is put in both sides equally to make a rectangle. Diameter = 10 cm Radius = 10 cm ÷ 2 = 5 cm Circumference = 2*π*r = 2*π*5 cm = 37.699... cm Then the length of rectangle would be, 37.699 cm (circumference) ÷ 2 which is around 15.7 cm. And so it would be 5.7 times longer than the circle's diameter. Please correct me if I am wrong. Thank you!
yes ofc the length can not be 10, u are not wrong. the problem said cut circle to pieces and reform them to rectangle, so area is constant. just do a quick count, if length is 10 and width is 5, its clear that two graphs has different area, it doesnt make sense. your reasoning is correct, dont be confused. length is 5pi, boy in vedio has wrong answer btw im a chinese master degree student, im also a chinese so u can trust me XD, its confused that those Top comments do not mention that, thats crazy bro, what a clear wrong answer but few people notice it. this reinforces my stereotype of the average youtube math level
Thank you very much for understanding my problem. I am a 9th grade student and I found the answer wrong in the video so I just posted this comment to notify people about the answer.
10:21 the answer is 5/96, in China, we were taught that if you put parentheses after division or subtraction, you turn the operation inside to the opposite (plus becomes minus, multiply becomes divide). Regardless of this rule, if you just calculate the equation in order you would arrive at 5/96, idk how Sheldon and Xianxian arrived at 3/40 but the host count it as correct….
any explanation on eclipse question? didn't get it though, if based on visibility, isn't solar eclipse closest answer to total solar eclipse, where you can't literally see the moon, whereas you still able to see the moon (darkened or reddish hue) under total lunar eclipse.
Question was "How much Longer the rectangle be from the circle?" The Circle's perimeter = 2piR The Rectangle perimeter = piR + piR + 5 (radius) + 5 (radius) = 2piR + 10 Hence the rectangle is 10 longer than the circle.
The thing here was the more we go into high school and stuff we are taught about learning formulas and applying it we are never taught about the logic and reason i mean in my country we wre taught like this and its very annoying, and this kid was really just smart really loved the concept
11:07 isn't the correct answer a lunar eclipse? a partial eclipse, by definition, just a skewed version of a solar or lunar eclipse (where the sun or moon, respectively, are not fully covered). A solar eclipse is when the moon covers the sun (aka the moon is VERY visible), and a lunar eclipse is when the earth stands between the moon and the sun, blocking all light from reaching the moon and making it effectively invisible. So, an eclipse where the moon is not seen would be best described as a lunar eclipse, no? In any case, the worst answer is by far a partial eclipse.
No, a lunar eclipse is a blood moon You see it on any part of the world that night as the moon passes the earth's shadow giving it the distinct red color, i think you're mixing up a new moon for it
the question comparing circumference and perimeter (the last one i think), was worded horribly. length is a dimension, a property of a rectangle. you cannot use it to refer to circumference and perimeter interchangeably, when it doesnt refer to either of those. you should have asked "how much longer is the perimeter of the rectangle, than the circumference of the circle." which is easy because i know it will be 2w longer, and the width must be equal to the radius, which is d/2, making the answer 10. i actually did the math quickly bc i wanted to see how long it would take, when i got 15.7 - 10 (or [10*(pi/2)] - 10) and saw that the correct answer was 10, i thought i had lost my mind.
You can still see the moon during a full eclipse. It becomes red. That question didn't make any sense. You can see the moon in either a partial or a full eclipse. It's just black.
Also the answer to the PEMDAS one at 10 is wrong, but you argue they used a different convention since it was wrote deliberately misleading in the prompt given to us. There is no precedence for the multiplication on the right just because it was using a parentheses instead of an x sign to indicate it. It's not an operation INSIDE the parenthesis. It should just be left to right hence: 1/6*24/64(2/3+1/6) = 4/64*5/6 = 1/16*5/6 = 5/96 Maybe the format was different in the problem you gave them
@@charlietian4023 calculators are known for interpreting PEMDAS incorrectly. When you have a number next to an equation in parentheses, it means that number is essentially distributed to each component of the equation in parentheses. en.wikipedia.org/wiki/Distributive_property Therefore, PEMDAS says 64(2/3 + 1/6) is the same as 64(2/3) + 64(1/6) = 128/3 + 64/6 = 256/6 + 64/6 = 320/6 = 160/3. Alternatively you could just do it the easy way 64(2/3+1/6) = 64(4/6+1/6) = 64(5/6) = 320/6 = 160/3. so then you have 1/6*24 / 160/3 = 4 / 160/3 = 4 * 3/160 = 12/160 = 3/40 FINAL ANSWER this equation is NOT meant to be solved left to right
Precisely. I got the same answer (although I call it BEDMAS)..doing it in my head i thought i messed up but they didn't follow the order of operations rigorously. -I feel like Sheldon was a good sport as many of the answers came right out of the child's textbook..like he just knew the answer. And doing simultaneous equations is a better way to approach the chicken & rabbit question than with guess and check... -Plus they seemed to cut out parts of his explanation at the end when he says he learned in a 'formulaic' way...
It's always frustrating to see controversial questions like this getting used in tests. Mixing the usage of x with space, and / with (%divide) would keep my eyes rolling.
Last question was unclear. I would have answered that the side length is about pi/2 times larger than the diameter (pi * r side VS 2 * r diameter) considering the limit of number of parts approaching infinity.
Also call me a hater, but this kid knew most of the answers beforehand. Expose him to problems he doesn’t know and we’ll see if he’s still able to solve them. (Hey, it’m still extremely impressed that he understood the problems and was able to explain them so well :D)
10:01 The expression is not well-defined; do you want to have $1/6 \times 24$ divide $64$ first then times $(2/3+1/6)$, or first compute $a := 64(2/3+1/6)$ then divide $1/6 \times 24$ by $a$? 11:49 All you have to compare is the area of the square and the area of the circle. Given they all have the same perimeter, it is obvious that the square has the largest area among the three quadrilaterals (this is just calculus, if you think about these quadrilaterals as deformation of the square, the area function maximizes at the square). Now without loss of generality assume the perimeter is 4, so that the square has area 1. The circumference formula implies the circle has radius 2/\pi, so it has area \pi (2/\pi)^2 = 4/\pi >1, QED
For those wondering about the last question. It’s a comparison of circumference and total perimeter. The “rectangle” is formed by let’s say dividing the circle into 4 equal parts (cool) and running them upward and downward facing next to eachother. Then the length is 2 on the top and 2 on the bottom. The sides added together is just the radius. In this case, we have a diameter of 10-so circumference is 10 PI. For the “rectangle”-10 PI is cut into two (5 PI on the top, 5 PI on the bottom) so we still have 10 PI. BUT, you are adding two radiuses together (5 and 5 on each side when doing a perimeter calculation) for a total of 10 more. If you had more than 4 parts, eventually this would converge on a rectangle as the curvature of each respective pi gets flatter and flatter and infinitely smaller.m width for each triangle. Say for example we had 200 pieces, each triangle cutout when facing and stacked next to next triangle cutout in the sequence has less and less curve and the sides get flatter. This is basically an integral. Anyways super impressive to see a little kid come up with this , and I think the question could’ve been framed better to be fair. I think this shows how kids simple thinking sometimes exceeds our overcomplicating thoughts as adults.
i agree with your solving but it means that they solve it wrongly, let's say we divided the circle into infinite parts so the rectangle length will b equals the circle perimeter, the circle perimeter equals pi*diameter=10pi so the circle length equals the diameter=10 and the rectangle length equal 10pi=31.4 by the way for every number of parts we will have different answer for the length of we want to be specific.
10:21 they are actually both wrong. Mathematicians ran into this problem in the 1900s and changed the definition of division to avoid paradoxes the answer is actually: 5/96
Bruh the last question is also misleading - it should have specified that long refers to the perimeter of the shapes not the shape itself. I thought the question was asking if how much longer in length is the longer side of the rectangle longer than the perimeter of the circle. I got a similar logic as the kid and would have gotten that right if the question was clarified
Thanks again Migaku for sponsoring this video! Migaku is offering a 50% discount on their Lifetime subscription, along with an additional free month on Standard and Early Access subscriptions: migaku.com/CantoMando
Can you basically watch anime in English even if it doesn’t have the official subs yet that’s a selling point you’ve missed
Even if you’ve no intention of learning a language
Did you guys choose this setting for filming on purpose 😂
You got a wrong answer for 1/6 * 24 ÷ 64 (2/3+1/6)
here how it should be :-
1/6 * 24 ÷ 64 (4/6 + 1/6)
1/6 * 24 ÷ 64 (5/6)
1/6 * 24 ÷ 64*5/6
4 ÷ 64 * 5/6
(4/64)*5/6
1/16*5/6
5/96
for more where ever you get (÷ x) it simply means (*1/x) just by replacing it clears confusion in order to not to get two answer
Thank you, @CantoMando, for the fascinating experiment. Among many other things, it underscores the cultural differences between Chinese and Western thinking. With due respect to Sheldon, the Chinese system is superior, despite each having its pros and cons.
The Western approach resembles the English language, where letters represent sounds, while the Chinese method uses characters that convey meaning directly. In English, you write one letter/aphabet at a time and then mentally process the word's meaning after completing writing it. In contrast, Chinese characters (pictograms or idograms) act as pictures that immediately represent their meanings directly. In short, Chinese is more efficient, smarter and speedier.
This contrast is evident in how each approach problem-solving. Sheldon follows an apparently systematic workflow to solve problems, while XianXian seems to grasp the answer instantly through a quicker, more fluid yet comprehensive mental process. This analogy extends to Western chess and Chinese weiqi: in Western chess, players advance step by step toward checkmate, whereas in weiqi, players simultaneously consider the overall strategy and individual moves, viewing victory as a holistic outcome. Today, in 2025, the Chinese have a significant advantage due to a more complete and holistic system that incorporates/integrates both methodologies, such as through embedding hanyu pinyin within Chinese characters.
😄😃😀
‘Are You Smarter Than a Chinese 5th Grader?’
Already love the concept
Seriously I see you everywhere
These men are Chinese net army
This isn't a test of who is smarter though, it's a test on understanding of certain material and the problems were handpicked for the kid. This video would feel less like clickbait if the problems were vector addition and calculus.
@@AL-pv2bqit’s a test on who is smarter he’s better at math then him that means he’s smarter
@@That_droper That is actually the lowest IQ reply I have ever gotten on UA-cam. 🎊 Congratulations.
I can confirm you that the discrete math course I took at UCLA (math 61) is just the repetition of the math I learned in 4th grade back in China.
why don't you come back and live in china?
discrete math also isnt generally hard
"discrete" ? is that a recent discovery/invention?
@@firstlast-pt5pp google it
@@duckymomo7935 yeah but if we were learning real analysis and group theory back in elementary school then I would have already got the nobel prize by now lol
The mother's happiness standing behind there and seeing how her child do the work is the best thing
Its kind of annoying that she's standing right there, too much of a control freak.
This
wym bro, shes probably really proud @@kairos_fluent
No. Studying that much at that age is not only unnecessary but also harmful in the wrong run.
I like how the 5th grader uses logic for the last question, but in America they require us to “show your work” which is super annoying.
similar - that's the idea
showing working is literally to show the logic/method you used to arrive at your answer, except showing working is specifically the mathematical method.
you could write out what the 5th grader said and you would still get full credit though
it is showing your work, they’re practically just using first order logic apply some additional definitions and theorems without having to actually write a proof for it
everyone can use logic when they are taught about logic , The boy already knew how to solve the problem that's why he solved it quickly give him a new problem which he never solved then see what happens .
if this is the level of a top 5th grader, it’s hard to imagine how smart those top students in tsinghua or peking uni
so what if a cure for cancer does not come out of China for example
My mom was Peking top in 1991(I meant for her major)
those unis are like the top of the top
Not necessarily only those from tsinghua but those from most top schools in China are also very competitive. It's insane. They are taught not just to memorise but to understand which is why it is amazing.
my history teacher got a bachelors and masters at peking, then a masters at harvard, then taught at harvard, then co-wrote the chinese textbook we use for our schools chinese curriculum 💀💀
I had friend in middle school who was from China and he said he was the worst student in his class so his parents sent him to the United States to live with his aunt and at our school he was a top student.😂
woahh its sad how the worst students there come out to be top somewhere else, they aren't really bad just in a wrong competition, but it does make them feel useless or not fitting into the society
man u dont even have to convince anyone I'm in hs and I barely do my work yet I'm in top 5 because I "barely" do my work whereas my classmates *do not* even do their work
😂😂
yeah and its the opposite case for me, I was the top student in my middle school and when we went back to China, I was only in the middle of the class while doing my best.
😮
people give Sheldon a break 😂
he actually did well, i've seen much worse after graduation
20:12 actually after Xianxian get into middle school and high school, he'll probably use the same methods like Sheldon. Xianxian used elementary school competition math here, being the top student of his class, there's no way he dont participate in math competitions (things like Mathematical Olympiad), where u solve problems with very limited tools, therefore u have to rely on logic, mechanisms and tricks.
In the end when we finish college education, we all solve problems like Sheldon, math becomes boring then unless u do research with the newest tools. Math is always more interesting when u feel your tools are limited for the problem
@@zeflute4586 - primary school is the most important time to learn to think - once they got thinking skills the rest is incentive and ambition
@@zeflute4586 very true most people are not understanding this thing.
😂
Yeah I don't think I could solve any of the math problems, except for the easiest ones. I thought Sheldon did well actually lol
Chinese people here. This knowledge is actually taught in extracurricular competition classes in primary school, but as an ordinary kid who has never attended those classes, there’s no way I can solve these problems. 🤣
They’re all classic problems.
Singapore Primary School Leaving Examination (PSLE) will have 1 or 2 logic questions to separate the students
@@firstlast-pt5pp That’s make sense
Have you considered maybe you're the black sheep
nah i had to do that rabbit probleem in class 6
That child articulated, and illustrated like a professor. Fluid, clear, assured and confident. Dear goodness... I'm intimidated 😆.
We all should be. Think how MANY of them there must be, given China's population AND their focus on education.
in Chinese we call it a "mental thinking" which is how different a person approaches an answer or just its unique way of thinking. (thinking outside the box)
I'm not Chinese but I did use this approach with the rabbit and chicken problem. When I saw the way the older guy solved it, I immediately chuckled because that was the way I was also taught in American schools (more systematic/formulaic approach). However, solving these problems by thinking it in your head makes it a more fun mental challenge.
That's how someone would think with very limited math tools (no equations etc.). That's how I did things before but felt like it was "cheating" because all the answers were so thorough and looked much more rigorous so I gave up on it and forgot with time lol. It's so much easier to just bruteforce everything with equations anyway.
The boy has a very deep & good knowledge of logic
He's more mature and logical than most adults
He is secretaly a programmer
Exactly
Jesus loves you!❤✝️Repent and God bless
@@Zero_Li24 you mean... most American adults
Fun Fact: The Final question is the question that led to the invention of calculus. Greeks trying to understand circles and their properties led to the discovery of concepts like imaginary numbers, and that started a chain of discoveries that would end up with calculus.
Doesn't attempts to solve the cubic equation led to discovery of imaginary numbers? Check out the imaginary numbers video from veritasium.
Calculas was discovered by Newton, i think....
@Chun350 Not exactly. It's a very long process that found it's origins in tbe Greeks as I said. Basically the. Trying to understand concepts like imaginary numbers is what snowballed into full blown calculus.
@@Chun350 newton had nothing to do with calculus
Translations and continuation of science is not a weird thing, natural science is always about test until it reaches law status;
and then newtonian but at plank length and black hole scope quantum mechanics takes over.
So yeah im not gonna spoil the tl section from the light novel then
I think I saw the Mao portrait shed a tear of a proud parent at the end
That’s sarcastic 😂
this is quite an inaccurate stereotype. study pattern is not really related to politics
@@NinaXiao-p3v fax. There are plenty of other countries that fosters patriotism like china, USA
Do chinese people like Mao?
China is a meritocracy socialist community. No affirmative action nor DEI. Just fierce competition for excellence for all.
Had a lot of fun filming this one. Want to highlight a couple points:
- was really fascinating to see the difference in ways of thinking. I look back and almost overcomplicated everything, and it's interesting to see that my brain went straight to formulas while that kid had a more simple approach. I think that way of thinking really was etched into me in University and I probably would have just thought about the problem from a non formulaic angle prior to engineering school 🤔 no way is right or wrong - it's just interesting to see how university influenced me to go straight to one default way of looking at problems.
2) btw let's appreciate how impressive that kid was. I don't think I would have solved it with the way I was going. I took 10 minutes to think of that last question and he went to go hang out with his mom and sister in the back 😂😂😂
You did great! ❤
We are taught formulas because they are fair and universal. They can be applied to chicken heads or rocket parts. Formulas are just a way of writing down the logic.
I am sure that if you were alone, and had time to think without social pressure, you would have done it. My university is ranked below yours and I had no problem even after graduating 9 years ago, stop making Waterloo look bad 😂 you'll drag down their ranking😉
yes, i notice myself doing that as well!
No way you passed calculus without being able to solve the last one.
Formulas are fine. They're generic ways to solve problems.
Sure you can apply other techniques like that chicken and rabbit problem. But, that's just another technique (or formula) that's less generic than expressing it as a simultaneous equation.
With the minimum perimeter/area question, I knew it'd be a circle because that's why many things naturally form spheres in life (e.g. water droplets minimizing surface area), but I would have double checked my intuition by writing out all the areas as well.
With the circle question, which was terribly worded, using formulas would have done the same thing once you recognize that the length of the rectangle is half the circumference. The kid was familiar with the concept of slicing a circle into a rectangle (often seen in deriving the area of a circle assuming you know the diameter) so he was able to use that to intuitively answer it.
Intuitive shortcuts are cool but they're specialized at solving a particular type of question. What's impressive from the kid is that he's familiar with all these shortcuts and was able to apply it all within seconds in his head.
QUICK CLARIFICATION on question 8 - this question was taken out of a Chinese school book and upon editing I realized it was completely lost in translation. In all three cases the moon should appear so the really question made no sense- SORRY GUYS!!!
Also for the question with a bunch of multiplication and dvision, the answer is 5/96 not 3/40
@@alexh715 Nope, it's a beautiful red color
@@evanhsiehYeah, I was gonna say… I guess it’s good Sheldon failed the last question because that means the 5th grader would have still won even counting the errors
Technically, the moon does not appear during a solar eclipse. You are seeing a silhouette of a moon.
@@tichu7 Idk if this is a reference to a song or whatever but if you are being legit, in a solar eclipse the moon is still present it’s just not illuminated by the sun
Sheldon you are so good with kids and such a great sport!
That kid is so bright and gracious too! Smart and impeccable manners! He is very smart but was so humble when he won- he was so gracious and he looked like he was about to cry when they handed him the 100 red pocket. Aww 😊
18:20 That is actually taught in middle school. You don't realize how much basic knowledge you have forgotten until you see it again in elementary or middle school textbooks.
idk why the engineer guy took so long,but you can literally see the thing,the part I think schools are failing is that they don't make children logical,they don't get the essence of reasoning
@@kazukawasaki97 exactly no one teaches where the heck the formula of area of a circle came from. its just remember the formula ask no more
@@shadowyt376 I'm not sure where you are from but I'm from New Zealand and in my school they emphasize on teaching where how the formulas are derived rather than giving you the formula.
@@porkchop7605 well its not the same all over the world thats what i am saying. im from india btw and apparently what they teach in most schools is not even enough to pass the grade.
For that question I still don't get it. When each piece is cut won't the ends be curved like a pizza slice? So how do they form a rectangle when put together? I think im missing something?!
Bro that kid is probably smarter than my smartest student in my grade, smartest student in my school and teachers
Damnnn😂
😅the boy just a medium student in China .I mean if you compare the whole city or country, not just his class
Exactly
Jesus loves you!❤✝️Repent and God bless
engineer: learned to solve in steps and show his work
kid: s o l v e.
Chinese education is tough man, I went to a school in china for a year and literally almost failed, another thing that makes it extremely hard, is the language, speaking it is easy, but writing and reading are hard af🙏😭
Bro u might go to the hospital if u go to koreans😂
@ all Asian schools are mad tough man, America is easy compared to them
i studied mandarin for four years but bruh, it was hell for me. speaking, reading, and writing drove me nuts. i couldn't even remember how i passed the class.
@@GetCookedByHyxkorean and chinese education is both difficult both will get u send to mental asylum there’s no competition their schedule timetable is almost the same
yep， 读写与说是disconnected 的
12:19 This mother is actually scary. She's definitely expecting results from her child haha
Well Asian mom 😅
12:56 it seems he managed to satisfy that requirement 😂
As an asian kid, tha part feels like a jumpscare out of horror movie
as a Chinese child, It is very difficult for us in school especially if your mother expects alot from you. and it very difficult to be consistent with your grade :((
@@白キロ us bro us
Last question also shows how the area of a circle was derived. My gradeschool teacher (bless her soul) told a story of its origin instead of just giving out formulas and calling it a day. Main reason I really liked math since then.
He was my favorite kid from the last video. So respectful
When you view things at the right angle, things are damn easy. You look it the wrong way, you are dealing with rocket science 🤣
not me feeling proud of myself that i understood the kid's explanation for the last question after not even being able to solve it myself at first when i tried. but it was an amazing way to look at that question, he's a genius!!
i hope this kid is loved by his parents and is enjoying his childhood
I was still learning fractions in 5th grade lol
I forgot fractions. lol
i was just learning how to multiply fractions and divide fractions in 6th grade
@@speckalI learned that in 5th grade
Where are you from?
I was still learning algebra in 5th grade lol💀
I love they are taught the foundations of maths and work anything with this principles. True understanding and a powerful tool.
sheldon did very well. that kid is top of his class, which means he does a lot of math olympiad questions, which are questions like the ones we saw. the boy is well trained.
Not really trained, the kid is just smart and uses simple (untrained raw intelligence) original thinking to solve problems. When you grow older, absorb so much knowledge and get trained, you will lose this capability. Of course, both are very smart. It's easier to use formulas, which implies lots of training, but lack of original thinking.
@@BX8UWT nah, if he gets training in math olympiad questions, he's used to questions that requires out of the box thinking. that already gives him an advantage. the questions are taken from chinese textbooks so i won't be surprised if he's seen some of the questions before.
this said, i'm not saying he's not smart, he is obviously very smart.
@@BX8UWT First of all, not trained is just false, the kid lives and breathes school which Id argue is incredibly unhealthy. Second, the kid did not do any original thinking this video, he clearly already knew all the olympiad problems and was trained on what tricks you would need to solve it, I once got a problem solving interview question, but I already knew the problem so it was incredibly easy to make myself seem like a brilliant problem solver. Thirdly, formulas are just tools, but figuring out how to apply them requires original thinking, notice how Sheldon at the end figured out the steps to solve the problem after the solution was revealed. Finally, giving kids puzzles and making them problem solve is brilliant, but every day 6 am to 10 pm is pointless and absurd, likely when you get to university or get a job you will never solve a single olympiad math problem ever again.
5 grader doing all in the head and directly writing the answer is impressive and he knows the concept
16:50 As a nerd, it is my duty to inform you that the plural of radius is radii.
🤓☝️erm actually that is only in English
Jesus loves you!❤✝️Repent and God bless
Those math questions bring back trauma from when I was a kid in China. You need math Olympiad training to get into good middle schools. And almost all of these questions are standard questions for 3 graders. I was considered a shit student back then so that was some fun time.
you need to learn to think which is a skill (trainable/learnable) starting in preschool - preschool and primary schools are the most important for mental development
@@firstlast-pt5pp yes, math Olympiad trains you to think. However, in that system, if you aren’t good at certain things (such as intense math Olympiad and poem reciting) that the school system wants you to be, you (an 8 years old) are a pile of horseshit. The system could, in Chinese saying, “kill a lot of buds in its infancy.” I am grateful that my parents saw how unhealthy that was, packed up, and took me to the US.
I went to an elite Chinese school in Beijing. It even had some crazy entrance exam for 5 and 6 year olds. And back then that was the best education one could receive there.
But all that being said, math Olympiad is probably optional. I’m pretty confident now I’m good at learning. I got a PhD last year for one. And I started teaching at a university in NY for another.
Sorry if this is too long. I saw math Olympiad questions and trauma kicked into my door and said hello to me.
@@dianew2007 - maths is just a platform to facilitate thinking lessons - that's why in the video the kid was asked to tell us his thought processes - if just an answer is required, just ask google/Alexa ( or ai ) - Einstein used his brain to imagine and think not storing information that can be retrieved externally ( ai today for example)
@@firstlast-pt5ppI think we are talking about two different things, but yes I agree with your opinion. What I was talking about is the extreme side of forcing kids to go through the ruthless system of you have to do math Olympiad or you fail that was prevalent in China 10-20 years ago, not sure about now. Like I said-it’s traumatic. Like your teachers would tell you in your face that “you are trash” kind of traumatic. Or “you think you’re good at school work now? girls are dumber than boys, and boys will catch up and be smarter than you” kind of traumatic. And yes that was what I was told back then in elementary school, which is what you mentioned as the most important phase of education.
@@dianew2007yet the USA is losing out to China in the critical technologies of the future these days
Where everyone gets a participation ribbon
I love that xian xian didn't bother with showing his working, just solved the questions with basic deductive skills lol
I believe the question at 10:21 is incorrect, the correct answer should be 5/96. This is because the 64(2/3+1/6) counts as multiplication and is not included in the brackets, so you would move left to right in order of operations.
Then you get:
4/64 (5/6)
= 1/16 (5/6)
= 5/96
I agree with you I found the same answer
I also got the same answer and searched up afterwards as well. We were right
This is what I got too.
The correct order is 1. Whatever that’s inside the bracket. 2. Multiplication denoted by bracket 3. Left to right multi/division. So you need to multiply 64 x 5/6 first.
@@Don-bo7lp I put it in the calculator, the answer is indeed 5/96
Well to be fair, the further up you go the more specialized you become in Math. You start focusing on very specific areas and equations while getting weaker in another.
Nah bro he's just weak as fck, like come on this is literraly questions for 7th-8th graders. And even if you don't think so I doubt an engineer would ever struggle with the last question. He doesn't understand sht about math. The answer is even explanable by this little kid... and your statement is like saying that we forget what's 2+2 the more we focus on specific areas of math... this is unbelievable
This is such a good video!!!! UA-cam algorithms shoud recommend it to more people!
sheldon: *graduates mechanical engineering*
Career: UA-cam video producer
Great video, really enjoy watching it. The kid is so smart!
let me explain the last question as i found the answer by myself, we know that opposite sides of rectangle are equal so here the catch, divide the circle into two equal pieces now the width of rectangle will be 5 units, {if you are not getting my point try to visualise this by dividing a circle into two parts expand it like a rectangle you will see that the radius will be the width no matter what} so the perimeter of circle will be 10pie or 31.4 units now let l be length of rectnagle so area of circle = area of rectangle ie,25pie=5l or l =15.7 and permiter of rect, =2{15.7+5}=41.4 now they askedd how much long will be the rectangle form circle so subtract the circle circumference from rectangle there you that 10.
Sheldon wasn't going to save the money until heard the kid say it😂😂😂
not the picture of president Mao in the back😂
which is not a Chinese thing, we don't hang leader's photo in classrooms or any places, the only place mao's picture is showed is the tiananmen square and on our currency.
I thought they chose this setting for filming on purpose 😂
Bruh for real 💀
Mao is the founding father of China, without Mao, no China today.
@@sammyhuang6416 it's not a Chinese thing to do, we don't hang leader's picture in classroom.
15:39 The question is not phrased properly. According to this question, the answer is: 5pi - 10
The question they meant to ask was this:
Given that the diameter of the circle is 10, how much longer will the *rectangle's perimeter* be from the *circle's perimeter*?
Then yes, the answer is 10.
4:22 The boy actually answered with the authentic term 大洋洲 Oceania.
Should I send my future kids to China for their foundational school years?? 😅😅 this kids thinking is so good 👍
Your kids will learn a lot in China. BUT he/she will also feel tired and every day under pressure.
dont its torture. let ur child live a more free and happy childhood
Your child must be able to handle stress well because it is very tiring.
No
Asked your child not us
I think sheldon is more surprised that all these adults havent seen these questions before and are still solving them pretty fast.
this child is smarter than 99.9% of the american voting population😮
smart people can be brainwashed too
no he isn't
@@firstlast-pt5pp yep smartly brainwashed
@@firstlast-pt5pp ture,people who are not brainwashed are believing that China still lives in caves and has never even seen a car or color TV.
@@cja12345: We don't have enough information to know. But he's a HELL of a lot smarter at MATH than the VAST majority of American students in 5th grade in public school systems. And I'd guess something over 99 percent seems about right.
They do a ton of logic puzzles that stretch their knowledge to their limits, so our fifth grader may not know calculus or what nitrogen is, he can do brain twisters like the circle problem no problem
I mean, at 0:46 his schedule is actually way harsher than 90% of other asian kids
不可能这么多，我高中也是7点上课到晚上10点，这个太夸张了
I got a score of 26 which while isn’t horrendous, it’s CRAZY how much smarter both Sheldon and the boy are!
For context I’m a 3rd year CS major with a 3.3GPA (was a 3.5 last semester but I ate a bad grade Fall 2024)
Nah 26 is crazy 💀
Or you're just dumb
I'm a 2nd year robot operator and my GPA is close to 4 although its around 3.9 GPA. I'm not asian and I'm not good at math for one thing. I guess I'm just a chill guy but they pay me scholarship and i never felt like I worked hard for it.
11:03 Wait a minute, you can always see a part of the Moon during partial eclipses (either Lunar or Solar). During total solar eclipses, the Moon is in front of the Sun and hides it. During total lunar eclipses, the Moon is behind the Earth which blocks the sun rays and so the Moon appears dark red through gamma rays (best answer in my opinion).
The only time a Moon might not be visible would be if it’s hidden by an object in the sky or maybe during a new Moon phase when it lays between the Sun and the Earth.
Yeah I think they were all wrong there lol.
Well for the last question, we somewhat studied the same logic also, basically cut a particular radius of a circle and extend them horizontally it then created a straight line (arcs) after that we apply the arcs formula to get the areas of different shapes
10:21 The answer is 5/96
There's a common misconception about parenthesis, it's true that we have to do whatever the operation is "INSIDE" the bracket first, but when we are done, we treat the bracket as a simple multiplication and don't give it priority.
After every operation INSIDE the bracket is done, the bracket becomes multiplication and we move left to right doing the operations
Edit: For People Asking for solution
1/6 × 24 ÷ 64 ( 2/3 + 1/6 )
Do the bracket
1/6 × 24 ÷ 64 ( 5/6)
This can be written as
1/6 × 24 ÷ 64 × 5/6
Go from Left to Right
= 4 ÷ 64 × 5/6
= 1/16 × 5/6
= 5/96
For reference I used Wolfram Alpha to cross check and bprp's yt video on order of operations.
Edit 2: I directly claim the ans is 5/96 cuz I have proof. Try to put out your beliefs or atleast don't provide baseless accusations.
Fr I was freaking out
How did you get 5/96
I keep getting different answers
@@TocaJac_ I Added the Solution on my comment, You can Check it out
You have parenthesis tho at the (5/6) meaning you have to multiply 64(5/6) first. Its weird that you applied the right rule for the 1/6 × 24 and you didn't apply the same thing with 64(5/6). Try reading about PEMDAS rule.
I was ecpecting the problem from the preview
"I'm disappointed and my day is ruined" © The guy that reviews burgers
Can someone clarify the moon question? Depending on the location, if your within the partial eclipse event, you should still see the moon. That's what makes it partial.
they wrote a comment saying in all three cases the moon is seen and the question just doesnt make sense
I looked up on google and it said solar eclipse is the correct answer. 🤷♀️
The solution to the math problem in minute 10 it’s not 3/40 but it’s 5/96. When you have multiplication and division you have to follow the order from left to right.
10:14 you both got it wrong. The answer is 5/96, not 3/40. I think "engineer" guy needs to relearn basic operational orders.
No way you sound so cocky and are still wrong, you definitely failed 2nd grade maths, there are different order of operation rules around the world that give different solutions to same expressions and all of them are right.
Using BODMAS,
1/6 × 24 ÷ 64(2/3 + 1/6)
=1/6 × 24 ÷ 64(4/6 + 1/6)
=1/6 × 24 ÷ 64(5/6)
=1/6 × 24 ÷ 320/6
=4 ÷ 320/6
=4 × 6/320
=24/320
=3/40
"Me when I forget PEMDAS" ahh comment
@@Nohomosapien maybe you forgot that division and multiplication starts from left lmao
1/6 × 24 ÷ 64(2/3 + 1/6)
=1/6 × 24 ÷ 64(5/6)
=4 ÷ 64(5/6)
=(1/16)(5/6)
=(1.5)/(16.6)
=5/96
you are tiring me with this instead of learning primary school math
@@samtheking5759 pemdas and bodmas are literally the same thing but ok
Tbh… the question was not well formulated. Engineering doesn’t test PEMDAS lol
These questions are easy for him as a primary school student, but difficult for me as a college student (Chinese education is really effective but tiring)
Study in a high ranking university ❌
Study in China elementary school✅
Sheldon's "Am I dumb" was just too relatable LOL. Nonetheless, I still think he did great competing with the 5th grader!
14:20 This is a fun problem. I did R=4 and C=2. 4x10 = 40 (finding the most legs possible) 40 - 32 = 8 (finding how many legs over 32 I have) 8 / 2 = 4 (finding the chickens I need to reduce the total down to 32) thus C = 4, R = 6 (6*4 + 4*2 = 24 + 8 = 32)
Didnt read what you wrote but 2x+40-4x=32 so x=4 thats it.
X is number of chickens
On the last question, my understanding of the answer is this: think of the circle like a pizza and the rectangle like all the pizza slices lined up together with the crusts facing the outside. Kind of like a mouth full of sharp teeth that is closed.
The question is how much longer is the overall perimeter of the rectangle shape than the circumference of the pizza.
We also know that the pizza is ten inches wide, which means that every slice is five inches long.
If you think about it, the only difference between the circle pizza and rectangle arrangement is that the length of a slice of pizza is exposed on the right and left side.
Since we know the length of a pizza slice is 5 inches and there are two exposed sides, the difference in length is 5+5, or 10.
15:43 This is just nitpicking btw, but I can’t be the only one who misinterpreted “length” in the last question to be the difference in their horizontal lengths (length of the rectangle minus the diameter of the circle, which would have given a value closest to 6), instead of the difference in their perimeters.
I was so confused when the answer was 10.😂
Haha that's what I thought! Difference in length is not the same as difference in the perimeter which is what the question said. I can understand the chinese child getting that because of language but yeh that answer I got 5pie-10 fairly quickly. But I learnt that in year 9. No way would I have gotten that in year 5 or even year 8!
Likewise, I had to replay it a couple of times and then read the comments if anyone could relate. We're the same haha.
For that question I still don't get it. When each piece is cut won't the ends be curved like a pizza slice? So how do they form a rectangle when put together? I think im missing something?!
@@albertchen247 The "rectangle" is an approximation. To be precise, the resulting shape is some shape with curvy edges, and you want to compare its perimeter against that of the original circle.
Yes. You are correct, will be curvy and hard to calculate. However, the thinner the slice you cut the circle, the straighter the curved edges will be. Imagine if you cut it into infinitely thin slices, the curved edge will appear to flattened out and more and more appropriate a rectangle when you combine the slices. @@albertchen247
That last question really wasn't worded properly, it tripped me up until 16:16 clarified that by "length" it was actually referring to perimeter (I missed the clarification until re-watching), 'cause otherwise...
if it were solving for length where length is L in L*W=10π, W->r, r=10/2=5, L=5π, so the rectangle would be 5π-10 longer than the circle which is π/2 times longer or roughly 1.5707
Actually, I think Sheldon gave the right answer for the first intermediate question of 5 marks because moon is partially visible during the partial eclipse
Sometimes I wish I never immigrated because my friends from hk were like
“Damn we learned this thing a year ago and you’re just learning this now?” 😭
I like the fact that Mao’s just chilling in the background staring at the camera lens.
the question at 10:02 is wrong, the correct answer is 5/96 using standard Order of Operations with places equal priority on multiplication and division.
if you don't believe me paste this (1/6)*24/64*(2/3+1/6) into google and then multiply the answer by 96
I thought that too and these types of questions always annoy me. Like if it's in parentheses then should we multiply first or divide what should be divided first. There are so many systems anyways, BODMAS, PEMDAS etc etc and each tells us to do different things. It's so so annoying bruh...
Correct i just wrote the same comment
Yeah you are right
Ambiguous notations are always shit lol
@@Warsorcerer2510 if parentheses are being multipled or divided you still read from left to right, if you do distributive property like how they did, you have to distribute the entire equation. So you need to distribute ((1/6)*24 / 64) to (2/3 + 1/6), they messed up by only distrubuting the 64 into the parenthesis.
As an 18 year old student in Ireland this is quite surprising, I would say any of my friends would be solving all these questions with ease, especially that last one
bro you dont have 5
18 bro not years past grad or like 9/10 yrs old
I would get the last question right if he said “perimeter” instead of just “longer”
I think maybe something got lost in translation, or the kid misunderstood the question, but the host didn't want to make things awkward. Should have just been very clear from the start. I solved it as the actual length of the rectangle versus the diameter of the circle, in which case it is 5pi-10, which is close to 5.7
As someone whose been told they’re “gifted” basically their entire life this video gave me a major case of imposter syndrome, I guess the geniuses in china are just built different 😂
The mom at the back 👽😴🥱🤑🤑🤑🤑🤑🤑🤑🤑😮💨😮💨😮💨😮💨😮💨
Edit fun fact in china there is a test and the bottom 50 percent will not get a job so everyone wants to learn a lot so they can get a job
Mom: let me save it for you 😊
I think they have enough money 🤑
I mean they are Rich;
Another thing: Australia is not part of 7 Continentals, Oceania is the correct one (consist of Australia, New Zealand, Papua New Guinea and others)
It’s “peek” not “peak”.
The game had already been lost before it began
🤓
Guys, I don't understand the circle problem at 15:40 . The question is talking about the length of rectangle.
So, the length would be circumference ÷ 2 because the circle is cut into triangular slices which is put in both sides equally to make a rectangle.
Diameter = 10 cm
Radius = 10 cm ÷ 2 = 5 cm
Circumference = 2*π*r = 2*π*5 cm = 37.699... cm
Then the length of rectangle would be, 37.699 cm (circumference) ÷ 2 which is around 15.7 cm. And so it would be 5.7 times longer than the circle's diameter.
Please correct me if I am wrong.
Thank you!
yes ofc the length can not be 10, u are not wrong.
the problem said cut circle to pieces and reform them to rectangle, so area is constant.
just do a quick count, if length is 10 and width is 5, its clear that two graphs has different area, it doesnt make sense.
your reasoning is correct, dont be confused. length is 5pi, boy in vedio has wrong answer
btw im a chinese master degree student, im also a chinese so u can trust me XD, its confused that those Top comments do not mention that, thats crazy bro, what a clear wrong answer but few people notice it. this reinforces my stereotype of the average youtube math level
Thank you very much for understanding my problem.
I am a 9th grade student and I found the answer wrong in the video so I just posted this comment to notify people about the answer.
It's like the dark knight rises the kid is Bane. 'you merely adapted to school I was born in it.'
10:21 the answer is 5/96, in China, we were taught that if you put parentheses after division or subtraction, you turn the operation inside to the opposite (plus becomes minus, multiply becomes divide). Regardless of this rule, if you just calculate the equation in order you would arrive at 5/96, idk how Sheldon and Xianxian arrived at 3/40 but the host count it as correct….
any explanation on eclipse question? didn't get it though, if based on visibility, isn't solar eclipse closest answer to total solar eclipse, where you can't literally see the moon, whereas you still able to see the moon (darkened or reddish hue) under total lunar eclipse.
I am a 42yo MD from Brazil and I solved all in my head.
For an engineer, the guy should be able to get them all right with ease.
Here I'm failing my highschool maths...
Question was "How much Longer the rectangle be from the circle?"
The Circle's perimeter = 2piR
The Rectangle perimeter = piR + piR + 5 (radius) + 5 (radius) = 2piR + 10
Hence the rectangle is 10 longer than the circle.
the question should be worded better
Memorising formula and applying it is good but understanding how numbers works is better
The thing here was the more we go into high school and stuff we are taught about learning formulas and applying it we are never taught about the logic and reason i mean in my country we wre taught like this and its very annoying, and this kid was really just smart really loved the concept
11:07 isn't the correct answer a lunar eclipse? a partial eclipse, by definition, just a skewed version of a solar or lunar eclipse (where the sun or moon, respectively, are not fully covered). A solar eclipse is when the moon covers the sun (aka the moon is VERY visible), and a lunar eclipse is when the earth stands between the moon and the sun, blocking all light from reaching the moon and making it effectively invisible. So, an eclipse where the moon is not seen would be best described as a lunar eclipse, no? In any case, the worst answer is by far a partial eclipse.
I was thinking that too..
No, a lunar eclipse is a blood moon
You see it on any part of the world that night as the moon passes the earth's shadow giving it the distinct red color, i think you're mixing up a new moon for it
19:40 he explained it so frkn well! this video made me weirdly happy? im studying engineering and struggling a bit but this motivated me somehow lol
the question comparing circumference and perimeter (the last one i think), was worded horribly.
length is a dimension, a property of a rectangle. you cannot use it to refer to circumference and perimeter interchangeably, when it doesnt refer to either of those.
you should have asked "how much longer is the perimeter of the rectangle, than the circumference of the circle."
which is easy because i know it will be 2w longer, and the width must be equal to the radius, which is d/2, making the answer 10.
i actually did the math quickly bc i wanted to see how long it would take, when i got 15.7 - 10 (or [10*(pi/2)] - 10) and saw that the correct answer was 10, i thought i had lost my mind.
Yes I was also wondering what exactly are they asking
10:40 They both got the answer wrong again the correct answer is B) Lunar eclipse.
But I think the answer is not in options it is new moon or amavsya in india
You can still see the moon during a full eclipse. It becomes red. That question didn't make any sense. You can see the moon in either a partial or a full eclipse. It's just black.
No, lunar eclipse is when the moon turns reddish
The secret is that mao zedong in the back for mental support
"Oh, the chicken-rabbit problem" NAHHHH HE'S COOKED 😂😂😂
Also the answer to the PEMDAS one at 10 is wrong, but you argue they used a different convention since it was wrote deliberately misleading in the prompt given to us.
There is no precedence for the multiplication on the right just because it was using a parentheses instead of an x sign to indicate it. It's not an operation INSIDE the parenthesis. It should just be left to right
hence: 1/6*24/64(2/3+1/6) = 4/64*5/6 = 1/16*5/6 = 5/96
Maybe the format was different in the problem you gave them
it's the same answer when you plug in the string i wrote into a calculator
@@charlietian4023 calculators are known for interpreting PEMDAS incorrectly. When you have a number next to an equation in parentheses, it means that number is essentially distributed to each component of the equation in parentheses. en.wikipedia.org/wiki/Distributive_property
Therefore, PEMDAS says 64(2/3 + 1/6) is the same as 64(2/3) + 64(1/6) = 128/3 + 64/6 = 256/6 + 64/6 = 320/6 = 160/3. Alternatively you could just do it the easy way 64(2/3+1/6) = 64(4/6+1/6) = 64(5/6) = 320/6 = 160/3.
so then you have 1/6*24 / 160/3 = 4 / 160/3 = 4 * 3/160 = 12/160 = 3/40 FINAL ANSWER
this equation is NOT meant to be solved left to right
100%. If they wanted to come to the other answer they needed to write the entire denominator below the line or put parentheses around it.
Precisely. I got the same answer (although I call it BEDMAS)..doing it in my head i thought i messed up but they didn't follow the order of operations rigorously.
-I feel like Sheldon was a good sport as many of the answers came right out of the child's textbook..like he just knew the answer. And doing simultaneous equations is a better way to approach the chicken & rabbit question than with guess and check...
-Plus they seemed to cut out parts of his explanation at the end when he says he learned in a 'formulaic' way...
It's always frustrating to see controversial questions like this getting used in tests. Mixing the usage of x with space, and / with (%divide) would keep my eyes rolling.
Last question was unclear. I would have answered that the side length is about pi/2 times larger than the diameter (pi * r side VS 2 * r diameter) considering the limit of number of parts approaching infinity.
amazing video so refreshing.
Also call me a hater, but this kid knew most of the answers beforehand. Expose him to problems he doesn’t know and we’ll see if he’s still able to solve them.
(Hey, it’m still extremely impressed that he understood the problems and was able to explain them so well :D)
These are general questions in Chinese primary school. To be honest, these questions are not easy, but not as hard as you think.
That is definitely not just memorization.
Im a mechanical engineer too. All I remember after graduation is mitochondria is the power house of cell
10:01 The expression is not well-defined; do you want to have $1/6 \times 24$ divide $64$ first then times $(2/3+1/6)$, or first compute $a := 64(2/3+1/6)$ then divide $1/6 \times 24$ by $a$?
11:49 All you have to compare is the area of the square and the area of the circle. Given they all have the same perimeter, it is obvious that the square has the largest area among the three quadrilaterals (this is just calculus, if you think about these quadrilaterals as deformation of the square, the area function maximizes at the square). Now without loss of generality assume the perimeter is 4, so that the square has area 1. The circumference formula implies the circle has radius 2/\pi, so it has area \pi (2/\pi)^2 = 4/\pi >1, QED
Those weren't the only inaccuracies, ironically.
The answer to which phenomenon the moon wouldn't appear in is obviously option A- the Solar eclipse.
For those wondering about the last question. It’s a comparison of circumference and total perimeter. The “rectangle” is formed by let’s say dividing the circle into 4 equal parts (cool) and running them upward and downward facing next to eachother. Then the length is 2 on the top and 2 on the bottom. The sides added together is just the radius. In this case, we have a diameter of 10-so circumference is 10 PI. For the “rectangle”-10 PI is cut into two (5 PI on the top, 5 PI on the bottom) so we still have 10 PI. BUT, you are adding two radiuses together (5 and 5 on each side when doing a perimeter calculation) for a total of 10 more.
If you had more than 4 parts, eventually this would converge on a rectangle as the curvature of each respective pi gets flatter and flatter and infinitely smaller.m width for each triangle. Say for example we had 200 pieces, each triangle cutout when facing and stacked next to next triangle cutout in the sequence has less and less curve and the sides get flatter. This is basically an integral.
Anyways super impressive to see a little kid come up with this , and I think the question could’ve been framed better to be fair. I think this shows how kids simple thinking sometimes exceeds our overcomplicating thoughts as adults.
i agree with your solving but it means that they solve it wrongly, let's say we divided the circle into infinite parts so the rectangle length will b equals the circle perimeter, the circle perimeter equals pi*diameter=10pi so the circle length equals the diameter=10 and the rectangle length equal 10pi=31.4
by the way for every number of parts we will have different answer for the length of we want to be specific.
10:21 they are actually both wrong. Mathematicians ran into this problem in the 1900s and changed the definition of division to avoid paradoxes the answer is actually: 5/96
Bruh the last question is also misleading - it should have specified that long refers to the perimeter of the shapes not the shape itself. I thought the question was asking if how much longer in length is the longer side of the rectangle longer than the perimeter of the circle. I got a similar logic as the kid and would have gotten that right if the question was clarified
Solving a problem in a simpler way is definitely smarter.
What a great video it was very entertaining. I really liked the type of questions, where else can I find similar questions?