The GCF is 70.
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The greatest common factor of the numbers '420' and '2646' is '42'.
hcf = 4 and lcm = 420
The hcf is 12
20=22 x544=22 x11The greatest common factor is 22 =420 = 4 x 5, 44 = 4 x 11 so HCF is 4
The GCF is 2.