# Rational & Irrational numbers

13/07/2020### Rational Numbers

A **Rational** Number **can** be written as a **Ratio** of two integers (ie a simple fraction).

Example: **1.5** is rational, because it can be written as the ratio **3/2**

Example: **7** is rational, because it can be written as the ratio **7/1**

Example **0.333…** (3 repeating) is also rational, because it can be written as the ratio **1/3**

### Irrational numbers

But some numbers **cannot** be written as a ratio of two integers they are called **Irrational Numbers**.

## π (Pi) is a famous irrational number

**π**** = 3.1415926535897932384626433832795… (and more)**

We **cannot** write down a simple fraction that equals Pi.

The popular approximation of ^{22}/_{7} = 3.1428571428571… is close but **not accurate**.