Question

What are the common factors of 45 and 60

Answer 1

1,3,5,16 I think are both the common factors of 45 and 60

Answer 2

The factors of 45 are
1, 3, 5, 9, 15, 45

The factors of 60 are
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

The common factors are the factors shared by both numbers, so
1, 3, 5, 15