1. you can see this as 13 is prime and it doesn't go into 45
The GCF is 1.
45 = 5 x 9, 117 = 13 x 9. 5 and 13 are co-prime so GCF is 9.
The GCF is 45.
The GCF of 45 and 50 is 5.The GCF is 5.
The GCF is 45.
The GCF is: 5
The GCF is 5.
The GCF is 1.
The GCF is 15.
The GCF is 45.
The GCF is 45.
The GCF is 9.