Question

Factors of 15: 1, 3, 5, 15

Factors of 20: 1, 2, 4, 5, 10, 20
What is the greatest common factor (GCF) of 15 and 20?
A. 5
B. 15
C. 1
D. 20

Answer 1

A. 5

Explanation:

It is A. 5 because if you look at the factors of 15 and 20, there are two common factos in both of them. 1 and 5, but the questions is asking for the greatest common factor of 15 and 20. 5 is greater than 1, so 5 is the greatest common factor, making A the answer.

Answer 2

A

Explanation: