Answer:
1. The GCF is 15 and the LCF is 1.
There are 4 common factors: 1, 3, 5, 15
2. The GCF and LCF is 1. This is the only common factor.
Explanation:
To find common factors, think about what two numbers you can multiply to get the desired values. The numbers that are the same for both desired values are going to be factors.