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Mathematics » Properties of Real Numbers » Rational and Irrational Numbers

# Key Concepts

This is a lesson from the tutorial, Properties of Real Numbers and we encourage you to log in or register before you continue, so that you can track your progress.

## Glossary

### Irrational number

An irrational number is a number that cannot be written as the ratio of two integers. Its decimal form does not stop and does not repeat.

### Rational number

A rational number is a number that can be written in the form $$\frac{p}{q}$$, where p and q are integers and $$q\ne 0$$. Its decimal form stops or repeats.

### Real number

a real number is a number that is either rational or irrational.

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