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 ${\Large\frac{p}{q}}$ , where p and q are integers and $q\ne 0$ . Its decimal form stops or repeats.

Real number:

A number that is either rational or irrational.