How many positive integers are factors of 120 and also factors of 40?

8

Step-by-step explanation:

The factors of 120 are:

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 30, 40, 60, 120

The factors of 40 are:

1, 2, 4, 5, 8, 10, 20, 40

All you need to do is find the factors that both numbers share, which are:

1, 2, 4, 5, 8, 10, 20, 40

Count those, and you get 8