What is the least common multiple of 15 and 30?

30 is the LCM (least common multiple) of 15 and 30, since 30 is the smallest number evenly divisible by both 15 and 30. Please see Related Link for a handy LCM calculator.

LCM is smallest number 15 and 30 are both a factor of, in this case 30.

15 x 2 = 30

30 x 1 = 30
The LCM of 15 and 30 is 30.