Factors of 21: 1, 3, 7, 21.
Factors of 7: 1, 7.
GCF (21, 7) = 7
The greatest common factor of 21 and 77 is 7.
The greatest common factor of 21 and 322 is 7.
The greatest common factor of 21 and 175 is 7.
The Greatest Common Factor of 14 and 21 is 7.
The greatest common factor of 21 and 56 is 7.
The greatest, (Highest) Common Factor of 21 and 56 is 7
The Greatest Common Factor (GCF) of 21 and 98 is 7.
The GCF is 7.
The greatest common factor of 14, 21 and 49 is 7.
The Greatest Common Factor (GCF) is: 7
7 is the greatest common factor of 14 and 21.
7 is the greatest common factor of 4942 and 21, or of 49, 42 and 21, if that is what you meant.