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The GCF is 9.
5
45=3x3x5 56=2x2x2x7 There are no common factors.
gcf of 37 and 81 is 1.
The GCF of 27 and 81 is 27. And their LCM is 81.
The GCF is 27.
The GCF is 1.
The GCF is 2.