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Anonymous
2 x 2 x 3 x 11 = 132
2 x 3 x 3 x 11 = 198
2 x 3 x 11 = 66, the GCF
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132 = 2*2*3*11
198 = 2*3*3*11
The common factors are 2, 3 and 11 so the GCF is 2*3*11 = 66