2, 3, 5, 7, and 11 are all prime numbers.
Each has only two factors ... itself and '1'.
The greatest factor common among them is the only factor common among them ... '1'.
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275 factor=5*5*11 396=2*2*3*3*11 11 is the GCF
The GCF is 2^3 x 5.
The GCF is 1.
15=1*3*5 40=1*2*2*2*5 gcf=5
2 x 3 = 6 2 x 5 = 10 The GCF is 2.