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One way to determine the common factors is to find all the factors of the numbers and compare them.

The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.

The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.

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

This also means the greatest common factor is 30.

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Q: What are common factors of sixty and ninety?
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