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Anonymous
The Greatest Common Factor of 42 and 18 is 6.
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The GCF is 6.
42 / 18 = 2 r 6 18 / 6 = 3 r 0 -> gcf of 42 and 18 is 6.
6
gcf(18, 21, 42) = 3. 18 = 2 x 3^2 21 = 3 x 7 24 = 2^3 x 3 hcf = 3
The GCF is 21.