Let’s ADD These Fractions Without Finding The LCD
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- Опубліковано 10 січ 2022
- TabletClass Math:
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Math help with adding fractions and finding the LCD, lowest common denominator. For more math help to include math lessons, practice problems and math tutorials check out my full math help program at tcmathacademy.com/
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easier would be to take the ratio of the numbers in the denominator : 8 : 10 = 4 : 5 and use the new numbers to calculate the numerator
in other words : 3 / 4 + 5 / 5 and perform your calculations to find numerator : 3 * 5 + 4 * 5 = 35
then for denominator you need to do some cross multiplication 8 * 5 or 4 * 10 both give 40
so the answer is 35 / 40
using divisibility rules, anything that ends in 5 or 0 is divisible by 5, so 35 / 40 = 7 / 8.
I paused the video BEFORE your starting of the solution presentation. I observed that 5/10 is exactly one-half! I rewrote it as its equivalent as 4/8! House, the final answer is 7/8!
same here
Change it 5/9 though. Now you can't make it quite so easy. I think this is a great method I'm so annoyed no one told me this before !
A beautiful mind is sensed.
Cool video. My favorite part is where it takes 4 and a half minutes to get to the problem.
lol hahahah
looooong winded for sure
He should learn to teach and stop talking too. Well, as they say: "IF you can, you do. If you can't you teach". So true in this case. Wonder if he''ll be blending CRT and SEL into his lessons soon as some math texts are attempting to do.
I love the Bow Method specially dealing with variables. You're great! Better than all my math teachers
true
Awesome teacher! Tusen takk!!
your videos have helped me alot with maths thank you!!
Great information, learned something new! Why start the problem 4 minutes into the video? This is easily a 2 or 3 minute video stretched into a 13 minute "novel"
That's why he loses about 90% of his viewers at around the 2 minute mark.
Very handy. Thanks.
Thank you. Why, when you multiply numbers, you move from bottom right to upper left and when multiplying letters, it becomes XH instead of HX?
When you multiply two numbers, you can place them in either order. For example, 3*5 = 5 * 3 = 15. Multiplication of numbers is said to commute. This is true for any number of factors. Both multiplication and addition are commutative. (If you want to get slightly more technical, these operations are commutative over the numbers we deal with everyday.)
@@NuncNuncNuncNunc That's not what the question of Debbie is about. At 5. 32 the instructor says 10 times 3, so right denominator times. left nominator. Why at 10.41 he does it the other way around, so x times h in stead of h times x. That's the question, and of course for the result is doesn't matter to use xh or hx. But the question is why is he not consequent in using the order in which he uses the values in the two situations?
Hey! I learned a new trick at age 59! Thanks! 👍
Good game thanks v much....I'm sending you a suloute from Kingdom of Bahrain 🇧🇭
I love math!
convert to decimal .375 + .5 = 0.875 or 7/8 or 14/16ths or 28/32's etc etc
@10:35 Since you are not given the factors of w and h you can't find the LCD, however, wh is a common denominator.
There is no explanation for why this works!
I love this method. I can't believe no one taught me this in school.
your teachers were awful. everyone knows this method
That's because you were not paying attention. You were busy with other stuff.
5/10 c'est 1/2. Étant habitué de mesurer en pouces pour des petits travaux de menuiserie, 1/2 + 3/8 = 7/8 sans compter...
LA MANERA MAS SENCILLA DE RESOLVER EL PROBLEMA ES LAS 5 DÉCIMAS = UN MEDIO CAMBIARLAS A 4 OCTAVOS = UN MEDIO 4/8 MAS 3/8 =7/8 Y YA.
I got 7/8s. 5/10 is equal to 1/2, which is also equal to 4/8. 3/8 plus 4/8 is 7/8s. I looked at a standard ruler.
May I know target subscriber for this channel or video if this level? Maths problems are very simple
I learnt the solution differently. If no LCD is readily available, multiply the 2 to get one hence using 80. Multiply the numerator by the respective number needed to get the denominator ie 3x10 and 5x 8. Simple
Learn the LCD method - you will still need to learn it well for when the numbers become letters, expressions in parenthesis etc and when you need to add three or more fractions, rather than two.
You don’t need to use LCD when adding more than two fractions 1/2 + 3/5 + 1/4
11/10 + 1/4
54/40
1 7/20
No this method works just as well for algebra as well, in fact it's much easier as there is no worrying about finding the LCD. If there are more than two fractions add two then keep repeating.
I would suggest reducing to lowest terms
11:08
I drew a pie to add them and it was simple
7/8. In a flash!
Okay, but in this problem there is a much simpler solution. 5/10th's is the same as 4/8th's, so 3/8th's plus 4/8th's is 7'/8th's. Done in one quick step.
I did the same.
And his "method" is really just multiplying the denominators and then multiplying the numerators by the same number the associated denominator was multiplied by. There are lots of ways to approach something like this once you understand the principles. I think the "bowtie" aspect would have confused the dickens out of me a kid. But, I've also never tried to teach this stuff.
@@ahwhite1398 Yep, he found a common denominator, just not the lowest one.
I did as I did when was young…. Took out a ruler and 5/10s is 1/2 plus 3/8 is 7/8s
(30+40)/80 =7/8
Reduce the second fraction to 1/2 now the answer 7/8
70 /80
i converted to decimals and added .375 plus .5 =.750 or 3/4
100% WRONG .375+.5 = .875 NOT .75 BACK TO GRADE 5
Why would I do this method when I can do it in my head in 5 seconds
15/40 + 20/40 = 35/40 = 7/8
Where do you get 20 from?
40
7/8 ... 5/10 is 4/8 so 3/8+4/8 is 7/8. I started doing this without noticing the second fraction wasn't simplified.
7/8
5/10=4/8 then add.
7/8 took me a second.
Find the fastest common denominator which is 80 and then reduce.
It’s so funny. Just a few days ago I commented how I never understood why American schools have students look for the LCD assuming real life will always give you easy low numbers as denominators. Other countries cross multiply; I learned this method in fifth grade.
When I returned to the US I explained this to my teacher who just told me that we will have to do it his way because my method was wrong; he didn’t know how we arrived at the same answer but just said it’s wrong. Thanks for going over this.
cross multiplying would give you the same answer?? i just tried it and i didn't get the same answer. perhaps i could've did it wrong too.
@@fallback8314 It works. I’m sure it’s been a while since we all did math
You multiply the two denominators and that becomes the new denominator.
Then add the products of your cross multiplication. That’s your new numerator.
This method is far superior for real life situations when the LCD is not easily found.
I do agree with you, I've posted so many times as to why this chap is obsessed with the LCD and you have appeared to answer that. In the UK we always use this method first then at least most if not all the class will be able to get the answer and feel some success even with lower ability students. Teaching the LCD way will mean that half the class (at best) will just not get anywhere and start to 'hate' maths.
@@markjakeway2035 you are absolutely right. LCD is simple when they are low multiples of each other, but in the real world you will run into situations when the LCD is not obvious.
Yes, I did see many get frustrated with math early on. I cannot play a musical instrument so I understand the frustration of “not getting it”. Ugh 😩
I will still use the traditional method.
Lets see 3/8 + 5/10 or 1/2. 1/2 of 8 (from 3/8) is 4/8 +3/8 = 7/8 takes just a few seconds not 13 minutes
But, you did find the LCD! You were able to do the numerator first if you wanted, but, you still found the LCD.
To by-pass finding the LCD, you would realize that 5/10 is an expression of 1/2. Well, 4/8 is also an expression of 1/2 and 3/8 plus 4/8 equals 7/8. I hope I was clear.
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so simple. Within a few seconds
The LCD is 40
No calculator, no paper... just simplify 5/10 to 1/2 = 4/8 then ( 3 + 4 ) / 8 = 7/8
Bam, just like that, 2 seconds of precious brainpower doing the math...
Among Us in real life SUS SUS
AmONg US In rEAL LIfe SUS SUS
to much introduction why you dont go directly to the fraction and solve
Too much waffle
More confusing than the traditional method. How dumb.
WHY?? 3/8+1/2=7/8. SOLVED IN 40 SECONDS!! YOU TAKE 12 MINUTES! MY THOUGHT IS TO SOLVE THE EQUATION THE FASTEST WAY POSSIBLE. PLEASE EXPLAIN
Stop talk this much and get to the dam point
Agree!!!
With all due respect. GET TO THE POINT....!!!
Agree so much talking in the intro 😢
What if the 5/10 was 9/10. One would still need to find the LCD. No new information. I still like your other posts.
F*ck me! Talk about 'smoke and mirrors'..... You are right, the bow tie method isn't LCD - in fact it is HCD......! As soon as you did 8 x 10 you are finding the largest LCD that is easiest to find. The rest is the same method. Thanks for the magic trick...but I worked it out.
Fractions? Why? Obsolete as cubits. 21 century digital age. Get with the program.
1/3 + 1/3 + 1/3 = ?
7/8 in 15 seconds. Such BS
I avoid math at all cost, myself, algebra nope nope
i 100% agree on algebra and calculus. they're utterly useless in every day life. fractions, percentages and decimals are useful though!
Are you really out to help Math students or just talk about other stuff? You can't do this every video.
too much commentary how about just a video that gets to the point????
wow what a complicaed crap ----- 8 and 10 common d is 40 ==35/40 or 7/8
Don’t talk so much. Get to the math.
You talk to much sir
5/10 how ridiculous is that for a mathematic teacher, one has to wonder... these videos are just adverts for his business.
7/8
15/40 + 20/40 = 35/40 = 7/8
7/8
7/8
7/8