It may be a few years since you were at school, but it really doesn’t hurt to refresh your memory with a little brain teaser every now and then.

Sometimes you can put your brain to the test with something you think is easy, only to be reminded of how much you’ve forgotten since your days in the classroom.

This math trick has lit up the internet, perhaps because so many people are being reminded of just that. They think they have the answer only to find they got it so wrong.

Can you handle the challenge?

What’s throwing many people attempting this puzzle is which calculation to do first. You have to consider the parentheses, multiplication, division and everything else.

I have to admit I struggled with this puzzle when I first saw it, but it was so obvious once I saw how to do it in the video below.

It seems I’m not alone in tearing my hair out over this puzzle. The answer is simple – once you know how.