The GCF of 16, 18 and 27 is 1.
The prime factorization of 16 is 2*2*2*2
The prime factorization of 18 is 2*3*3
The prime factorization of 27 is 3*3*3
The numbers have no common factors except 1, so that is their GCF.
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The GCF of 16, 18, and 36 is 2.
The GCF is 2.
The greatest common factor of 18 and 55 is 1.
The greatest common factor of 39 and 18 is definitely 3.
The GCF is 2.