The GCF is 1.
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6, is the greatest common factor of 12 and 18.
The greatest common factor of 18 and 55 is 1.
The greatest common factor of 39 and 18 is definitely 3.
The greatest common factor of 18 and 33 is 318 = 2 x 3 x 333 = 11 x 3GCF = 3
The greatest common factor of 18 and 100 is 2