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What are the common factors for 15 and 21?

Updated: 8/20/2019
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11y ago

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The factors of 15 are: 1, 3, 5, 15

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

The common factors are: 1, 3

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13y ago
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11y ago

Note that these terms are factored to:

15 = 3 x 5

21 = 3 x 7

Then, the common factor is 3.

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Q: What are the common factors for 15 and 21?
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