How to work the percentage of any amount instantly
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- Опубліковано 30 вер 2024
- This percentage trick is so easy - and you should know it if you are a regular here!
Forgotten it? That's OK...youtube and tecmath has your back - with this, the easiest way to work out percentages of an amount.
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More percentage tricks: • Percentage made easy -...
I wish you were my math teacher when I was still in school...
Thanks
I love your videos.
he is my math teacher
@@tecmath same I love your vids
As per usual, I’m amazed that we are not taught this method in school. Your channel is such a great resource. I’m learning so much. Thanks very much!
100%=40
10%=4
1%=0,4
So 5,2
BTW i found this way myself i actually try find easy ways my self.
Great work. Most 'tricks' are just observations and thinking about things a tiny bit differently. Love that you do that!
I used to be scared of figures and watching this method is bringing a smile to my face again! 😁
Way too complex. Percentages are just multiplications with a hidden divide-by-100 tagged on (which equals “times 0.01” ofc). So, to get 13% of 40 you do this:
13 x 40 x 1/100 => 13 x 4 x 1/10 => 52 / 10 = 5.2
I don't have a 'maths' mind (I'm more into languages). I find his technique very clear and I can practice it step by step. However as I now understand his method I can also see your method too. I would never have been able to make the connection between the two myself.
knew this one tec, great refresher for those who forgot, amazing technique
If you are good with multiplication then you just multiple and count the decimal points using the trailing zeroes.
How about 13 x40 =520, divided by 100 (for the percentage thingy) =5.2
I also noticed that when you do a percentage of a two digit number ending in 0 like the first two examples, it's the tens place times the percentage number then move the decimal point one space left in the answer: 13 x 4 = 52, make it 5.2.
It's the similar for those that don't end in 0 as well, 32 times 75 = 2400, 2400/100 is 24
@@LoudMinded if that’s the case, move the decimal.
Math teacher: just use my method!! you'll fail!!!
techmath: no, no I don't think I will
This type of trick is also there for division of imperfect numbers
I will show
Lets say 15 ÷ 4
Now make different parts of number 4 as follows:
1 part of 4 = 4
2 parts of 4 = 8
3 parts of 4 = 12
Now the closest 1 we have is 3 parts = 12
To get to 15 we need 3 more than 12 which means that we do not need a full part of 4
So we will take 3 parts out of the number 4 which means we need 3/4 more than 12
So we got 3 parts of 4 = 12 and 3/4 parts of 4
So ( 3 + 3/4 ) × 4 = 15
Easy ☺
👀
Sorry mate your lost me at imperfect numbers
This is helping me so much in many ways. I love your soft and kind voice. It helps to learn easy and better. I'm gonna try for other numbers now. Thank you Sir ❤️
I found it easier to do “40% of 13” instead. Which is 10% of 13 (1.3) times four = 5.2.
You mentioned this briefly with 32% of 75, but I think it deserves a mention. Always try to find the easier percent - generally the one that’s divisible by numbers like 5/10/25/etc :)
I was too focused on this trick i forgot the swap method
Thanks for all your help but i have a faster way
Calculator? Alexa? Straight multiplication (you can use this - but for some reason some people find that harder!)
@@tecmath no i acctualy do it myself well i dont use calculators and things i just like school more than the average percentage.
There's always someone.....
An even easier way: 13 x 4 is: 52. Add decimal and you’re there. 5.2.
Brilliant. I watched only the first 28 seconds to learn the trick... Multiply two numbers and divide by 100, right?
This video has made me realise that I don't understand maths at all lol
you have a good deep voice
I turned it around and figured 10% of 13 and multiplied that by 4.
Thanks so much for this. You explain it beautifully and its actually good fun!
I am incredibly grateful for your work. I watch it for fun now, math is so cool.
Your tricks are pure awesome and fun
Plus your voice make them more exciting
It's also useful to understand that A% of B is exactly the same as B% of A. This sometimes allows for quick mental calculations. Thus, 17% of 30 is the same as 30% of 17, or .3 thimes 17 = 5.1
I use the rainbow multiplication on percentages and it works too , it’s actually pretty fast
1x4
1x0
3x4
Brilliant explanation! Thank you so much. 👍
I'm happy at my age to find some help with my percentages. I need more examples with your answers! It's amazing how I am disabled with solving match equations.
Great explanation/demo...👍
Thank you 😊
This is how I’d do it for a more difficult problem (such as 22% of 52) but for a problem like this (13% of 40) I’d switch the percentage number (A% of B=B% of A, or for this problem, 13% of 40=40% of 13) then do this method (1.3x4=5.2)
I still can't get it 😪
i swear your channel is a life saver i have loads of test coming up soon and this rlly helps😩
Thank you, this helped me so much!😀
Pure Perfection!
5.2. 10%x40= 4; 1%=.4. 4+3x0.4= 4+1.2= 5.2. Learned how to do this in Primary School in the 60s.
I still remember the I owe you 100 dollars. It basically also helped with word problems with percentages. Yes I see where you are coming from, and I do this in my head already. But if you sit there and try to teach me new math, I will just glare at you and walk away. Just like I still do the old chants in my church upbringing, even though I do not go to church today. Autistic, and I hate change.
I paused the video to work out the questions.
21% of 70 = X
20% of 70 = 14
1% of 70 = 0.7
14 + 0.7 = 14.7 = X
32% of 75 = X
10% of 75 = 7.5
7.5 * 3 = 22.5
2% of 75 = 1.5
22.5 + 1.5 = 24 = X
56% of 420 = X
50% of 420 = 210
1% of 420 = 4.2
4.2 * 6 = 25.2
210 + 25.2 = 235.2 = X
EDIT: added spacing
Too much for me...I'll just use Google to give me the answer. I always HATED math in school and still do 70 years later.
Devide the %age by 100 then multiply it by the number which is 40 in this case. You can do it all in ur head. BTW where that accent comes from?😀
Too complex explanation...I computed the answer faster using the old method than this demonstration for a simple percentage problem...
Saying "simple" does not help. Thanks for the videos.
It's simple do like this-
Ex- 56% of 420....?
Ans-420/100=4.2*56=235.2
Easy 1.30 times 4. Is 5.20 in my head you don't have to do all that writing and it took you much longer than 3seconds
Don't forget that 13% of 40 is also 40% of 13. So 13x(2/5) = 26/5= 5.2.... 5s😉
Or just multiply 40X13 and move the decimal over 2 to the left.
You belong teaching teachers who teach teachers. Too many people have math issues. Some are now calling Math racist.
Why weren't we taught this method at school? Did they teach this method at school? Was I paying attention at school, or was I too busy looking out of the window?!
Sorry but thsts not the fastest. What u should do is = times the prcent by the number and then devide the answer by 100
Ur welcome
P S i am not hating
I wish I knew you in my school time. You are a great teacher sir , respect!
Oh my god just multiply the two numbers and move the decimal point two spaces and you are done.
Wow! just because we know this or other ways doesn't mean others can't learn just wow......
That was easier than school! RIGHTEOUS!
Additional good good trick is that you can take away parts too. So if you need 9% then it is easy to work out 10% and 1% as shown and take the 1% off the 10%.
Long process. Just multiply 4*.13=5.2
13% of 40 =
= (40*13)/100
40*10+40*3 = 400+120 = 520
520/100 = 5.2
"Hey Google! What's 13 percent of 40?"
Great approach
Please make video on mensuration formulas please i have an exam sir please help me
Why does it take 7 minutes to say divide 40 by 100 and multiply by 13.
Don't bother about it, I have a calculator so why disturb my small head?
Or you can multiply 13x4 and divide by 10.
My maths teacher was the best, why all these calculations for such a small number, use a calculator, retail staff use scanners theses days,even tells them how much change to give lol
Dang! Just multiply 13 times 4 ....greez
@tecmath can you show us how to solve 6 ➗ 0.0003 please 🥺🥺🥺
HOW DID THEY NOT TEACH ME THIS BACK IN GRADE SCHOOL?!? HATED PERCENTAGES! :(
I believe 13% of 40 should be 5.2
Or 0.52
Easy , yes but it certainly takes longer than 3 seconds.
For clarity's sake, when you wrote out the fifty, five, and one percent amounts, it would have been nicer for adding purposes to have written the units, tens and hundreds (and tenths) in their allotted columns so we could add more traditionally. Or is that way a practice common to this channel? 🤔
But i have thought of a better way. It probably has been used.
Say we had 26% of 60
Multiply 26 and 60 which is 1560 and divide it by 100 which is 15.6.
Give it a try :) @tecmath
There's no way you can figure it out in your head in 3 seconds.
I forced myself to learn a different way (MOSTLY self taught) which is not unlike your method, I really do like this, it is smooth. Basically it was to flop the numbers around until you had something to work with that was closer to 10. Such as 31% of 70, you could easily flop it around to 70% of thirty one. Sometimes I did the tenth like you. If I would have seen this video when I was 6 yo, it would have saved me many an angry night.
This what I should see in recommends!!!
I got 56% of 420 wrong because I miscalculated, but your calculation is really simple. I may have to start using your method.
As a mathematics professor this way is difficult
I thought a method that is multiply the number by the percentage and remove zeros until you think that is the result, for example 60% of 120, 60x120 = 7200 so i remove the 2 zeros and the result is 72, this method i use it for calculate an approximate of a discount in markets and stores when only says the percentage off
I always found that complicated and room for lots of mistakes. I always divided the amount by 100 x the percentage you wanted.
You are a legend!
Unnecessarily complicated,
but how else would you work this out? i thought this was the normal way
Love your videos mate. gudonyah
Hi bud, I am wondering if you could show the calculation(s) of these type of problems using multiplication? Or, do you have another video showing this? Cheers :-)
So stoked that what I’m already doing is finally endorsed!! 👍🏽🇦🇺
Or you can use this,
x% of y = y% of x
Example : 4% of 75 = 75% of 4
i.e 3.
16%of 13
should be 2.080
Why do math teachers make things so hard...
I just multiply and always get it right
الساحر باغر لو كيڤ گميلك
Just too bad how we were taught to do many math equations because now, after doing it the hard way for many (mannnny) years, it is difficult to switch over to a new method. Just takes practice, I'm sure.
Just do 13 x 4 and move the decimal
To get 1% of 40, divide 40/100 = 0.4
Then multiply 0.4*13 = 5.2
Maths is racist. This is a racist video.
even easier way is to break down to 1% and then multiply by the number you're looking for.
love it. Although I wish he would keep the numbers aligned to the decimal place …..
Awesome video thanks for making calculations faster for me!
How come I'm not getting this one⚽❓⚽
14.7
24
235.2
13/100 × 40 = 5.2
more simple 40: 100 = .4 13* .4 = 5.2
How about cm to inches.
I got my Calculator right beside me. Piece of cake doing these.