Factor them.
2 x 3 x 11 = 66
2 x 2 x 2 x 11 = 88
2 x 3 x 3 x 11 = 198
Select the common factors.
2 x 11 = 22, the GCF
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The GCF of 66 and 88 is 22.The GCF of 88 and 66 is 22
The GCF is 4.
The GCF is 2.
The GCF of 242 and 2123 is 11.
The GCF is 2.