## What is the percentage ?

A **percentage of a number** is a fraction of the denominator **100** of that number.The word **percent** comes from the phrase per cent. Cent is a root that means **one hundred**, so per cent literally means per one hundred

Percentages are written with the notation **%**.

### How to calculate a percentage ?

To find a certain percentage named **P** of a totality named **T** from a fraction (part) **t** of this totality **T** we use the formula :

### the easiest percentages to remember

There are several **easy-to-remember percentage values** that will make it easy for you to calculate the percentage without using a calculator:

- 50% : 50 percent means the half, to calculate the 50%, simply divide the number by 2
- 25% : 25 percent means one fourth, to calculate the 25%, simply divide the number by 4
- 10% : 10 percent means one half of 10 percent, to calculate the 10%, simply divide the number by 10
- 5% : 5 percent means half, to calculate the 5 %, simply divide the number by 100 and multilply the result by 5
- 1% : 1 percent means
**one hundredth**, to calculate the 1 %, simply divide the number by 100