Figuring out percentages can be a nightmare - especially if you haven't got a calculator to hand. But now, a maths whizz has blown people's minds on Twitter after sharing a simple way of working out ...

The "shoe magic" trick is making its way around the Internet. (See above.) It's a nifty little math trick, and it does indeed work (most of the time). I will first use my own data to demonstrate. I ...