### GCSE Maths Revision: Multiples, Common Multiples & LCMs

#### 4th April 2017

GCSE Mathematics Revision for Number Syllabus

Multiples, Common Multiples and Lowest Common Multiples for GCSE

These are terms that you will have encountered throughout KS3. However, they remain important and you must revise them for your GCSE examinations. Questions on multiples, common multiples and LCMs are likely to come up on examinations across the boards, including AQA, OCR, WJEC and Edexcel, so it is worth spending some time listening to our song to get to grips with what they are and how to work them out.

Multiples - it is the resulting number when you multiple a number by another whole number. For example, multiples of 4 include:

4, 8, 12, 16, 20, 24, 28. 32…..

This is because 1x4 = 4, 2x4 = 8, 3x4 = 12 etc.

Common multiples - this is a number that is a multiple of two or more numbers in a set. For example, what are the common multiples of 4 and 6?

Multiples of 4 are: 4, 8, 12, 16, 20, 24, 28. 32, 36, 40…..

Multiple of 6 are: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60…..

The common multiples of 4 are thus: 12, 24, 36…..

Lowest common multiples - this is the lowest multiple that is shared by two or more numbers. Let’s take the above numbera as an example:

Multiples of 4 are: 4, 8, 12, 16, 20, 24, 28. 32, 36, 40…..

Multiple of 6 are: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60…..

The common multiples of 4 are thus: 12, 24, 36…..

The lowest common multiple is  12.

Now that you know all the basics, listen to our GCSE Revision song and take our GCSE revision quiz, it will help you on your way to success in your GCSE Mathematics.

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