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The Ultimate Trick for Calculating Percentages All Kids Need to Learn


For me, calculating percentages has always been a hell of a chore that I didn't want my worst enemies. I admit that math has never been my thing, although I have come to find it fun to draw functions, divide numbers, or solve for X's in equations. But when the percentages came in, my knees were shaking, even if at first it seems like a minor task.

And now the Internet (or rather a Twitter user) goes and surprises me with a trick to get percentages so simple that it has caused me a shock of emotions. Why didn't they teach it to me at school to save me so much suffering? Fortunately, you can still 'save' many children who today need to know this little 'trap': the ultimate trick to calculate a percent percent of a number.

It all started when user Ben Stephens posted a tweet that read: “A fascinating little trick to make percentages: x% of y = y% of x. So, for example, if you need to mentally calculate 4% of 75, you just have to turn it around and calculate 75% of 4, which would be easier ”.

Fascinating little life hack, for doing percentages:

x% of y = y% of x

So, for example, if you needed to work out 4% of 75 in your head, just flip it and and do 75% of 4, which is easier.

- Ben Stephens (@stephens_ben) March 3, 2019

And suddenly, the magic (or rather the math) has been done. All my sleepless nights are solved by turning the%. I have no idea how much 28% of 50 is… But calculating 50% of 28 is much easier: 14!

I have not been the only one who has felt a bit silly for not having noticed this trick before (a relief). The tweet has been filled with responses such as: "I have a career in applied mathematics and I have never known this", "My calculator just exploded" or "Everyone needs to know this."

Unfortunately, we have not yet discovered the universal panacea. While this trick can help you a lot to calculate some percentages, others are still suitable questions to be solved by NASA. For example, what is 37% of 52? … 52% of 37, it is just as complicated. But at least, this trick is a good start to understanding the percentages and, without a doubt, it will make your life easier.

And what more math tricks can kids help? For the sake of all the little ones, here is a selection with many other tricks that will make their lives much easier.

1. The commutative property as the solution to complicated multiplication tables

I don't know if you will agree with me that the most difficult multiplication table is 7 (although 9 is also close to it). I always doubt, for example, what is the result of, for example, 7x3.

But, thanks to the commutative property, multiplications can be turned around and the result remains the same ... And the 3 table is much easier.

2. The Russian table to multiply

Have you ever seen this table so colorful and full of numbers? We present the Russian table to multiply, which will reduce the worries of your children produced by mathematics and more specifically by multiplication.

Using it is as simple as looking for the numbers that are part of the operation in the white vertical column and the white horizontal column. When looking for the intersection of both, the result is obtained. As simple as that!

3. Japanese trick to multiply a very large number

Multiplications of large numbers are very complicated and above all boring. You have to remember all the numbers that you have already multiplied and those that remain to be multiplied, the ones that you take with you… But this Japanese trick only requires a sheet of paper and something to write.

It consists of drawing lines that intersect at different points, which will tell you the result of the multiplication. Don't miss the slightly more detailed explanation.

4. The butterfly trick to add fractions

How do you give your children fractions? And add them up? If the response is regular, you must pass on the butterfly trick. It is about solving the mathematical operation as you draw this insect, with its wings and antennae. This trick is ideal for solving the sums of fractions that do not have the same denominator. Pay attention to the full explanation to perform this trick and it will be much easier for you.

5. Learn the multiplication tables with your hands

There are also different tricks to learn the multiplication tables only using the fingers of the hands. A fun game that will help children in their math classes. Don't miss the explanation of how this particular math trick works.

You can read more articles similar to The Ultimate Trick for Calculating Percentages All Kids Need to Learn, in the On-site Learning category.


Video: Fractions: Adding, Subtracting, Multiplying and Dividing (October 2021).