-14 = -1*14
28 = 2*14
Thus the GCF is 14. Do not be inclined to believe that the GCF is -14. Although -14 may be a common factor, it is less than 14, hence not the greatest common factor.
The GCF for 28 14 is 14.
GCF(14, 28, 42) = 14.
GCF(56, 28, 14) = 14.
GCF(56, 28, 14) = 14.
The GCF is 14.
The GCF is 14.
The GCF is 14.
The GCF of 14 and 28 is 14. Since 14 is a factor of 28, it is automatically the GCF.
GCF(14, 28, 21) = 7
The GCF of 28, 42, and 70 is 14.The GCF is 14.
The GCF is 14.
The GCF is 14.