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The greatest common factor for 12, 20 and 24 is 4. Individually factorize each number wiht prime numbers (numbers which do not have any factors except for 1 and the number itself) such as 2,3,5,7,11, etc. Then out of all the 3 factorizations, take the common number that appears in all the 3 factors and multiply them. 12 = 2*2*3 20 = 2*2*5 24 = 2*2*2*3 So the common factors in all the 3 numbers is 2*2 = 4. This is the GCF (greatest common factor)

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16y ago

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