GCF

Find the Greatest Common Factor of the following sets of numbers:

1. 5 and 25 $\rightarrow \mathbf{5}$
2. 6 and 7 $\rightarrow \mathbf{1}$
3. 10 and 55 $\rightarrow \mathbf{5}$
4. 12 and 48 $\rightarrow \mathbf{12}$
5. 12 and 30 $\rightarrow \mathbf{6}$
6. 50 and 90 $\rightarrow \mathbf{10}$
7. 45 and 105 $\rightarrow \mathbf{15}$
8. 12, 20, and 80 $\rightarrow \mathbf{4}$
9. 14, 28, and 56 $\rightarrow \mathbf{14}$
10. 15, 25, and 100 $\rightarrow \mathbf{5}$