# Percentages

## What Is a Percentage?

A percentage is a part of a whole. It expresses a part of a whole number as parts out of 100. A percentage is written as a number followed by the percentage symbol % (said as "percent"): This is 20% (said as "20 percent"). It means 20 parts out of 100. A grid with 100 squares is a useful way of visualizing percentages. In the grid below, 20 out of 100 squares are colored blue. 20% of the squares are blue. ## Dictionary Definition

The Merriam-Webster dictionary defines a percentage as "a part of a whole expressed in hundredths."

## Percentages A percentage is a way of expressing a part as a proportion of a whole. In this mini-curriculum, you will learn the basics of percentages.

Percentage
A percentage is a part of a whole. It expresses a part of a whole number as parts out of 100. This is 1%. It is 1 part in 100.

Find the Percentage of a Number
Find the percentage of a number by dividing the percentage by 100 then multiplying the answer by the number: Express as a Percentage of a Number
A number can be expressed as a percentage of another number: Read more about how to express one number as a percentage of another number

## Percentage Changes A percentage change is the change from one value to another value, expressed as a percentage. In this mini-curriculum, you will learn about how to find percentage changes.

Percentage Change
A percentage change is the change from one value to another value, expressed as a percentage. Here is an example of a percentage change: A number increases from 10 to 12. The change (2) is 20% of the original number (10). It is a 20% percentage change.

Find a Percentage Change
Find a percentage change by expressing the change in a number as a percentage of the original number. ## Converting Percentages Percentages are just one way of expressing a part of a whole. Fractions and decimals are other ways. In this mini-curriculum, you will learn how convert a percentage to a fraction and a decimal.

Convert Percentage to a Fraction
A percentage can be converted to a fraction. Convert Percentage to a Decimal
A percentage can be converted to a decimal. 