what's the LCM of 9 and 15?
I got 9
is that the correct answer?
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.
To find the least common multiple (LCM) of two numbers, such as 9 and 15, you need to find the smallest multiple that is divisible by both numbers.
First, you can determine the multiples of each number:
Multiples of 9: 9, 18, 27, 36, 45, ...
Multiples of 15: 15, 30, 45, 60, ...
Looking at the multiples of both numbers, you can see that 45 is the first common multiple. Therefore, the LCM of 9 and 15 is 45.
So, the correct answer is 45, not 9.