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The GCF of 12 and 20 is 4.
The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 20 are 1, 2, 4, 5, 10, and 20.
The factors they have in common are 1, 2, and 4. Therefore, 4 is the greatest common factor.
The greatest common factor can also be determined from the prime factors by multiplying the common prime factors together.
The prime factors of 12 are 2, 2, and 3.
The prime factors of 20 are 2, 2, and 5.
The common prime factors are 2 and 2, so the greatest common factor is 2 x 2 = 4.
The greatest common factor of 12 and 20 is 4
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