My 13yr Old Brother is sooooooo Coooooooooool!!! -smiles-

He explained to me a theory he came up with, just because he was bored...

let me explain, it's so cool:

~How to find the square root of a number~

First you find the square of a number, for example, the square of 2

2 x 2 = 4

you then take the "next" number in the number line.. so after 2 is 3.. and you add 3 + 3 , and subtract the answer by 1 ...

2 x 2 = 4
3 + 3 = 6
________
10
-1
_____
9

and that's the answer for 3 squared...

3 x 3 = 9


soo.. let's do a few:

2x2=4
3+3=6-1 + 4 = 9

3x3=9
4+4=8 -1 + 9 = 16

4x4=16
5+5=10 -1 + 16 = 25

...

20x20= 400
21+21= 42 -1 + 400 = 441 ... and 441 is 21 squared!!!

... -smiles-... subHan Allah, I love my brother!

-smiles- or you can use a calculator -smiles-