Math tricks – part 1 – Squaring numbers

This is a series of cool math concepts such as tricks to find squares and 9 tables, plus some other things about math you may have not noticed.

Today lets talk about a cool trick to square a number that I discovered.

To find a square, you can add a number in a special way so that if you have 4, you do 1+2+3+4 like that. Its like factorial(!) except you add instead of multiply. Then just multiply by 2 and subtract the number you’re squaring. you have your answer!