The GCF is: 18
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18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, . . .
It is: 144/162 = 8/9 simplified
18, 36, 54, 72, 90, 108, 126, 144, 162, 180
18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, . . .
gcf of 144 and 54 is 18.