You factor out both numbers 154 = 2*11*7
198 = 2*11*9
Now look and see which factors the numbers share. (2 and 11)
Multiply the factors (2*11 = 22)
22 is the gcf or greatest common factor
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Greatest common factor of 198 and 275 is 11.
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The GCF is 66.
The GCF is 1.
The GCF is 18.