Factor them.
2 x 3 x 3 = 18
2 x 2 x 3 x 3 = 36
2 x 2 x 2 x 2 x 3 = 48
Select the common factors.
2 x 3 = 6, the GCF
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The greatest common factor of 39 and 18 is definitely 3.
The GCF is 3.
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