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