# 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."

## The Curriculum

A brief description is given for each mini-curriculum. Click the MORE button to learn more.

## 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: ## 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. 