Decimals are the part of the number which come after the decimal point. This part of a number shows a part of a whole or 1. You must be comfortable using them as they are used all the time.

**Examples:**

0.1 is the same as 1/10

0.01 is the same as 1/100

0.001 is the same as 1/1000

0.243 is the same as 234/1000

0.002 is the same as 2/1000

2.0 is the same as 2/1

**Terminating Decimals**

These are decimals which end straight away (1.5, 0.1234, 1.2345).

**Non-Terminating Decimals**

These are numbers which have decimals which do not stop. These include numbers such as PI or recurring decimals like a third.

**Decimal Places**

Decimals may not be very short. Many answers may give a long string of decimal places which don't seem to end. Questions in an exam may ask you to give answers to a specific degree of accuracy.

For example:

If x = 12.3456789

x to 4 significant figures is 12.35

x to 4 decimal places is 12.3457