## Percentage

What is a

**percentage** and how it is calculated in mathematics?

The word

*percentage* is from Latin words

*per centum*, that means

*by a hundred*. The

**Percentage** is a number/ratio expressed as a fraction with a denominator equals to

*100*. For example

**25 %** could be expressed as

.

A

**percentage** value is denoted by the percent sign

**%**, also the abbreviations

**pct** or

**pc** can be used. A percentage is a pure number, it does not have any unit of measurement and is dimensionless.

/Usually percentages are in a range from 0% to 100%, but they could be greater then 100%, e.g. 150% or 240%, or they could be a negative percentage like -45%. These percentage values are usually used when it's necessary to descrive changes in values or compare the values.

## How to use Percentage Expert app