# This Maths Trick Is Our New Favourite Party Game

A weirdly clever maths trick can figure out a person’s year of birth and shoe size with just a few simple sums, but some online commentators aren’t feeling so impressed. Enter our parallel universe to find out why maths is suddenly cool on Twitter.

A maths trick that can work out someone’s shoe size and age in six easy-as-pie steps is making the rounds on Twitter, but is it any good?

According to online experts the trick has been around for years, but no one really cared (turns out maths equations don’t float many people’s boats – go figure!).

But since Twitter got its claws into the trick it has caused a furious debate on the social networking site, with some saying their minds have been blown, while others reckon it’s all a bit of a con.

Here’s the trick so you can try it for yourself…

1. Find a willing participant and ask them to write down their shoe size, but not tell you

2. Then ask them to multiply that by five

4. And then multiply that number by 20