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The common factors of 21 and 66 are 1 and 3.

The factors of 21 are 1, 3, 7, and 21.

The factors of 66 are 1, 2, 3, 6, 11, 22, 33, and 66.

The common factors are 1 and 3.

The greatest common factor is 3.

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8y ago
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14y ago

let's see ; 21 = 3 times 7 ; 66 = 2 times 3 times 11.

3 must be the greatest common factor.

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Q: What are the common factors of 21 and 66?
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What are the factors of 21 and 66?

The factors of 21 are: 1, 3, 7, 21 The factors of 66 are: 1, 2, 3, 6, 11, 22, 33, 66


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