In mathematics, a percentage ("%") is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred" in French).

Choose, if you would like to find A, B or X and insert the other two values!

## A is X% of B

$$X\% = \frac {A}{B} \times 100$$

## B is X% bigger/smaller than A

$$X\% = \frac {B - A}{A} \times 100$$