The Greatest Common Factor (GCF) is: 4
The factors of 21 are: 1, 3, 7, 21The factors of 28 are: 1, 2, 4, 7, 14, 28The common factors are: 1, 7
8: 1, 2, 4, 828: 1, 2, 4, 7, 14, 28
84
The LCM is: 252
The GCF is 4.
14
84
There are none.
364
It is: 4
The GCF is 7.