3 x 3 x 11 = 99
3 x 5 x 11 = 165
3 x 11 = 33, the GCF
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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.
Prime factorization of 288 = 2x2x2x2x2x3x3Prime factorization of 40 = 2x2x2x5Prime factorization of 24 = 2x2x2x32x2x2 = 8, the GCF