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The GCF of 54 and 63 is 9

The factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54.

The factors of 63 are 1, 3, 7, 9, 21, and 63.

The factors they have in common are 1, 3, and 9. Therefore, 9 is the greatest common factor.

The factors can also be determined from the prime factors.

The prime factors of 54 are 2, 3, 3, and 3.

The prime factors of 63 are 3, 3, and 7.

The prime factors they have in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.

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Q: What is the greatest common factor of 54 and 63?
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