0
Anonymous
The GCF is 3.
Wiki User
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
1 and 3
1
It is: 1