## Key Concepts

**Real numbers**

## Glossary:

**Irrational number**- 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 number that can be written in the form [latex]{\Large\frac{p}{q}}[/latex] , where
*p*and*q*are integers and [latex]q\ne 0[/latex] . Its decimal form stops or repeats.

**Real number:**- A number that is either rational or irrational.