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Factor them.
3 x 3 = 9
3 x 5 = 15
Combine the factors, eliminating duplicates.
3 x 3 x 5 = 45, the LCM
The LCM of 9 and 15 is 45.
The LCM is: 180
The LCM is: 45
90
36
180
It is 36
13
The LCM is: 18
The LCM is 18.
It is: 36