Factor them.
2 x 3 x 3 x 3 = 54
3 x 3 x 3 x 3 = 81
Select the common factors.
3 x 3 x 3 = 27, the GCF
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The Greatest Common Factor (GCF) of 27, 81, and 54 is 27.
The greatest common factor of the numbers 48 and 42 is 6.The GCF is: 6
The GCF is: 3
27 and 486, respectively.
The GCF is 27.