The GCF is 1.
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The greatest common factor of 42 and 66 is 6.6
The greatest common factor of 16 and 42 is 2.
Since 3 is a factor of 42, it is automatically the GCF.
Greatest common factor of 42 and 28 is 14.
The greatest common factor of the numbers 210 and 84 is 42.