The GCF of 12 and 54 is 6. To find the GCF, write the prime factorizations of each number.
The prime factorization of 12 is 2*2*3
The prime factorization of 54 is 2*3*3*3
The factors in common are 2*3 = 6, so that is the GCF.
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The greatest common factor of 12 and 54 is 6.(12/6 = 2, 54/6 = 9)
The GCF of 12, 18, and 54 is 6
The greatest common factor of 54 and 80 is 2
12
The greatest common factor of 54 and 90 is 18.