You need at least two numbers to find a GCF.
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The greatest common factor of 630 , 84 = 42
The Greatest Common Factor of 21, 63, 84: 21
Greatest common factor of 420 and 504 is 84.
The greatest common factor of the numbers 210 and 84 is 42.
Greatest common factor for 35 and 63 and 84 is 7.