Unit 12.2

# Decimal Numbers

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## 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 five pounds and ten pence (£5.10).
• Your balance is ten pound and sixty-five pence (£10.65).
• His height is one point seven two metres (1.72 m).
• 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 / four point ninty eight.

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