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The GCF of 21 and 36 is 3.

21 = 3 x 7

36 = 2 x 2 x 3 x 3

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

The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36

The common factors are: 1, 3

The Greatest Common Factor (GCF) is: 3
3
The GCF is 3.

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6y ago
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7y ago

The greatest COMMON factor is 3.

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Q: What is the greatest common factor of 21 and 36?
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