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21st Nov 2023

‘Perfect’ method to solve percentages is blowing people’s minds

Ryan Grace

Where has this trick been all my life?

Geometry, trigonometry, algebra… high-school Mathematics is definitely no joke.

In fact, it can have a pretty stressful effect on the lives of millions of teenagers every year.

But fear no more!

A new video from Science girl on social media platform ‘X’ shows a genius way to work our percentages without a calculator.

@gunsnrosesgirl3 aka Science Girl on X

Percentages have never been easier!

There’s more than one way to skin a cat, and there’s more than one way to solve a percentage.

Many people opt for the method of multiplying the starting number by the percentage number as a fraction.

So for example:

To get 60 percent of 80, you multiply 80 by 0.6, giving you 48.

It’s a quick and sure-fire way to get the answer you need IF you have a calculator handy.

But what if your phone is dead? What then?

A pupil uses a calculator in a maths class (Photo by Matthew Horwood/Getty Images)

Science girl percentages hack can be done in your head

The video posted to the account @gunsnrosesgirl3 demonstrates the easy hack that doesn’t require a phone or calculator.

To do a percentage, you simply divide both numbers by ten and then multiply them by each other.

So, 40 percent of 30 is 4 x 3, which equals 12.

A college student reviewing Calculus homework at a table (Photo by JHU Sheridan Libraries/Gado/Getty Images)

Why is this not taught in schools?

Users have been absolutely mesmerised by the method, with many asking why we don’t learn it growing up.

One user asked: “How come I did not know about this formula?”

While another wondered: “Why is this method not popularised in educational books to teach students?”

To be honest, it’s a good question!

So, next time you’re out for dinner and need to calculate a tip, remember the teachings of Science girl.


Life Hack,Math