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the greatest common factor is 7,

because 21 divided by 7 is 3,

28 divided by 7 is 4

and 56 divided by 7 is 8.

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More answers

Factors are numbers you can multiply together to get another number.

21: 1, 3, 7, 21

28: 1, 2, 4, 7, 14, 28

The common factors of 21 and 28 are 1 and 7.
1 and 7

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Wiki User

8y ago
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The common factors of 28 and 21 are: 1 and 7

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Wiki User

15y ago
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Q: What are the common factors of 21 and 28?
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