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 45.
The GCF is 1.
The GCF is 5.
The GCF is 15.
The GCF is 45.
The GCF is: 5
The GCF is 9.