Here’s a simple maths trick your can impress your friends and family with, writes .

The 'magical' maths trick which shows how you can determine a person’s age from their shoe size has been widely shared on social media in recent weeks.

This is how it works:

1. Take your shoe size

2. Multiply it by 5

3. Add 50

4. Multiply by 20

5. Add 1015

6. Subtract the year you were born

The answer you come up with should be your shoe size (first two digits) and your age.

The one caveat is the trick will not work if you’ve already had your birthday this year.

So how does it work? You can see how the trick works using some basic algebra:

Real Clear Science’s Alex B. Berezow explains: “Do you see why it works? No matter what your shoe size is, it will always be the first two digits of the answer.

“The age part should be obvious. [The current year] - y [your birth year] will give your age.”

bbabo.Net