Respuesta :

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