### Common Factors

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

- Example 1. What are the common factors of 12 and 30?

The factors of 12 are 1, 2, 3, 4, 6 and 12

The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30

The common factors are in both lists

So, the common factors of 12 and 30 are: 1, 2, 3 and 6

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