The GCF is 1.
The factors of 28 are 1, 2, 4, 7, 14, 28. The factors of 33 are 1, 3, 11, 33. So the GCF is 1.
Because 28 and 33 don't share any prime factors. In that case, the GCF is 1.
The GCF is: 1
The GCF is 33.
66
The GCF is 33.
The GCF of 33 and 66 = 33
The GCF is 33.
The GCF is 33.
The GCF is 11.
The GCF is 33.