# Classifying numbers review

Review whole numbers, integers, rational, and irrational numbers. Then, practice identifying each.

## Whole numbers

are numbers that do not need to be represented with a fraction or decimal. Also, whole numbers cannot be negative. In other words, whole numbers are the counting numbers and zero.

**Examples of whole numbers:**

## Integers

are whole numbers and their opposites. Therefore, integers can be negative.

**Examples of integers:**

## Rational numbers

are numbers that can be expressed as a fraction of two integers.

**Examples of rational numbers:**

## Irrational numbers

are numbers that

*cannot*be expressed as a fraction of two integers.**Examples of irrational numbers:**

## How are the types of number related?

The following diagram shows that all whole numbers are integers, and all integers are rational numbers. Numbers that are not rational are called irrational.

*Want to learn more about classifying numbers? Check out this video.*

## Practice

*Want to try more problems like this? Check out these exercises:*

Classify numbers: rational & irrational

Classifying numbers