### AuthorAndrea Ruth

Thursday, March 7, 2019

Math can be confusing and difficult. There are types of math we’re taught in schools that we never find a use for later on and some that we use on a daily basis. One such type of math adults often find a use for is percentages and recently, a Twitter user named Ben astounded many with an easy hack to solve them

“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 do 75% of 4, which is easier.”

## Peoples minds were blown

“This is the day Twitter changed my life,” one user named Antonio van Oijen commented. “I earn a living as a scientist, juggling numbers every day, and I never realised this.”

“Not sure whether I should be happy or embarrassed…Maybe both,” he admitted.

Having a daughter in fifth grade has meant a lot of pain and anguish surrounding math homework. So often these days, parents trying to help with their kids’ homework get the same response: “we don’t do math like that.” The sentiment seems to go both ways.

## Common Core math isn’t all bad

Common core math often makes math problems needlessly complex, which is why math hacks like Ben’s percentage trick are so exciting.

I still contend there is no substitute for learning one’s times tables by rote, and each multiplication problem shouldn’t need to have a story written about it to grasp it. 60 x 8 needn’t take up a half a page and be broken down by 10s.

Regardless, I’ll be sharing this percentage hack with everyone I know, including my 5th grader. Although, being 11 going on 21, I’m sure she won’t appreciate it until she’s older.