It is: 1
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3 x 3 x 11 = 99 3 x 5 x 11 = 165 3 x 11 = 33, the GCF
That appears to be a little backwards. It makes more sense to find the GCF of 56 and 154 using prime factorization. 2 x 2 x 2 x 7 = 56 2 x 7 x 11 = 154 2 x 7 = 14, the GCF
2 x 43 = 86 2 x 7 x 11 = 154 The GCF is 2.
The GCF of 20 and 66 is 2. The prime factorization of 20 is 2*2*2 The prime factorization of 66 is 2*3*11 Their only common factor is 2, so it is their GCF.
1, 111, 19The GCF is 1.