## Introduction

The Decimal System allows us to write the numbers that are not whole.

We need to read **decimal numbers** one by one to prevent confusion.

## Form

**Decimal numbers** have two parts:

- the first part appears
**before**the**full stop**, and it is the whole number; - the second part appears
**after**the**full stop**, and it is a tenth.

## Example

*This book is*(£5.10).**five pounds and ten pence***Your balance is*(£10.65).**ten pound and sixty-five pence***His height is*metres (1.72 m).**one point seven two**- 10.05
**ten point zero five** - 1.5
**one point five** - 0.5
**zero point five** - 0.55
**zero point five five**

## Use

We use **decimal numbers** to talk about numbers that are not whole.

Reading the numbers as a whole, may be problematic (e.g. *point one* may be *0.1* or *0.01*). To prevent this, we read the numbers one by one.

## Summary

**Decimal numbers** are composed of two parts: the first part, before the full stop, is a whole number and after the full stop, is a tenth.

We have to read **decimal numbers** one by one.

For example:

— *“4.98*” = * four point nine eight* /

Let’s revise this content within the {Form} section. Take a look at the {Example} section that shows its use within a context.