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Anonymous
The GCF is 18.
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GCF of 18 and 36 and 54 is 18.
GCF(36, 54, 72) = 18.
36 and 54's highest common factor is 18.
gcf(81, 36) = 9 gcf(27, 54) = 27 gcf(81, 36, 27, 54) = 9