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The factors of 18 are: 1, 2, 3, 6, 9, 18

The factors of 63 are: 1, 3, 7, 9, 21, 63

The common factors are: 1, 3, 9

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What is the greatest common  factor of 18 and 63?

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What are the common factors of 54 and 63?

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