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Factors that are the same for two or more numbers are their common factors.

What numbers are factors of both 7 and 8?

Factors of 7 are 1, and 7.

Factors of 8 are 1, 2, 4, and 8.

Common factors are the numbers that are in both lists.

So, 1 is the common factor of 7 and 8.

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