Common Multiples
1

6 is a factor of 12, 18, 24, 30, ... We say that 12, 18, 24,30, ... , etc. are all multiples of 6. In the same way, 8, 12, 16,20, ... , etc. are all multiples of 4.
2

Notice that 12 is a multiple of both 6 and 4. We say that 12 is a common multiple of 6 and 4; 24, 36, 48, ... , etc. are also common multiples of 6 and 4.
3

Example

Give three common multiples of 3 and 11, 4,5 and 6.
4

33 is a common multiple of 3 and 11. Likewise, 66 and 99.
5

120 is a common multiple of 4,5 and 6. Likewise, 240 and 360.
6

Note: To find a common multiple of a set of numbers, multiply the numbers together.
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