what's the LCM of 9 and 15?

I got 9
is that the correct answer?

3 answers

No.

Multiples of 9 are: 9, 18, 27, 36, 45, 54, 63

Multiples of 15 are: 15, 30, 45, 60, 75

What is the smallest number that is a multiple of both numbers?

http://www.math.com/school/subject1/lessons/S1U3L3GL.html
45?
Right. 45 is the LCM of 9 and 15.