To
square a number, multiply it by itself.

1^{2}= 1 x 1 = 1
2^{2}= 2 x 2 = 4 3^{2}= 3 x 3 = 9 4^{2}= 4 x 4 = 16 5^{2}= 5 x 5 = 25

## Note : you are NOT multiplying by 2

Squaring
a number is called raising it to the power of 2.

Examples
of other powers:

The root of
a square is what you need to be able to make that square.

The square root, multiplied by itself, makes the original number.

The
special symbol is √

Examples

## Note : you are NOT dividing by 2!

Symbols for other roots

Examples

leading to

Starting with rectangular numbers,

or

Since triangular numbers are 1/2 of rectangular numbers,

© Alexander Forrest