Whatever you use, you need at least two numbers to find a GCF.
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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
5 x 7 = 35 2 x 2 x 2 x 7 = 56 The GCF is 7.
The GCF of 14, 31, 39, and 56 is 1. One way to solve the problem is to notice that 31 is prime, and can't possibly be a factor of 14, which is smaller.If you prefer, you can write the prime factorization of each number in the set and find the GCF:The prime factorization of 14 is 2*7The prime factorization of 31 is 31 (1*31)The prime factorization of 39 is 3*39The prime factorization of 56 is 2*2*2*7So the GCF is 1.
3 x 3 x 5 = 452 x 2 x 2 x 7 = 56No common prime factors, the GCF is 1.
7 x 7 = 492 x 2 x 2 x 7 = 56Select the common factor.The GCF is 7.