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The factors of 15 are 1, 3, 5, and 15.

The factors of 39 are 1, 3, 13, and 39.

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

You can also determine the greatest common factor from their prime factors.

The prime factors of 15 are 3 and 5.

The prime factors of 39 are 3 and 13.

The prime factors they have in common are a single 3, so the greatest common factor is 3.

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Q: What is the greatest common factor of 15 and 39?
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