The greatest common factor for 12, 18, and 30 is 6.
The factors of 12 are 1, 2, 3, 4, 6, and 12
The factors of 18 are 1, 2, 3, 6, 9, and 18
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30
Thus, GCF (12, 18, 30) = 6
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Because 12 isn't a factor of 18.
The greatest common factor of 18 and 55 is 1.
The greatest common factor of 39 and 18 is definitely 3.
6, is the greatest common factor of 12 and 18.
The GCF is 2.