Sometimes it is. Without specific numbers, we can't say what your GCF is, but if 3 isn't the GCF, then it's because another number is.
The GCF is: 1
LCM of 105 and 21 is 105.
The GCF is 3.
The Greatest Common Factor is 3
The GCF is 3.
Divide them by their GCF, which is 3.Divide them by their GCF, which is 3.Divide them by their GCF, which is 3.Divide them by their GCF, which is 3.
The GCF of 3 and 45 is 3.Since 3 is a factor of 45, it is automatically the GCF.
The GCF of 30 and 66 is 6.
The GCF is 3.The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 3.