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To find the GCF of two or more numbers you can find the factor pairs of each number and then find the factors they have in common.

9:

1 x 9

3 x 3

21:

1 x 21

3 x 7

The GCF of 9 and 21 is 3.

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10y ago
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8y ago

The GCF of 9 and 21 is 3

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15y ago

3

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Q: What is the greatest common factor of 21 and 9?
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