Factor them.
2 x 2 x 2 = 8
2 x 2 x 3 = 12
Select the common factors.
2 x 2 = 4, the GCF
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gcf(9, 8) =1 gcf(9, 12) = 3 gcf(8, 12) = 4 gcf(9, 8, 12) = 1
The GCF of 4, 8 and 12 is 4.
The GCF is 1.
The GCF is 4.
The GCF is: 8