The GCF is 3.
7 
7
The GCF is 7.
The greatest common factor of the numbers 21 and 84 is 21.
7. 7x3=21 7x8=56
7, 14 and 21
The Greatest Common Factor of 15, 21, 28: 1
The GCF is 7.
1 and 3
63 - 1, 3, 7, 9, 21, 63 6 - 1, 2, 3, 6 the GCF is 3
It is: 1