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The factors of 16 are 1, 2, 4, 8, and 16.

The factors of 38 are 1, 2, 19, and 38.

The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.

The factors common to all three are 1 and 2. Therefore, the greatest common factor is 2.

The greatest common factor can also be determined from the prime factors.

The prime factors of 16 are 2, 2, 2, and 2.

The prime factors of 38 are 2 and 19.

The prime factors of 72 are 2, 2, 2, 3, and 3.

The prime factors they have in common are a single 2, so 2 is the greatest common factor.

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Q: What is the greatest common factor of 16 and 38 and 72?
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