### Common Multiples

The common multiples of two numbers can be found by listing the multiples of each number and then selecting the common multiples that are in both lists.

- Example 1. What are the common multiples of both 4 and 5?

The multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44,...

The multiples of 5 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50,...

Note: 20 and 40 appear in both lists

So, the common multiples of 4 and 5 are: 20, 40, (and 60, 80, etc ..., too)

to: