Prime factors of 12: 2*2*3
Prme factors of 77: 7*11
Therefore the GCF is 1
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It is: 1
It is: 4
That is not what prime factorization is for.
Whatever you use, you need at least two numbers to find a GCF.
2 x 3 x 13 = 78 2 x 2 x 2 x 13 = 104 2 x 13 = 26, the GCF