Best Answer

To find LCM, prime factor each number

15 = 3 * 5

20 = 2 * 2 * 5

30 = 2 * 3 * 5

Now put enough of those factors together so you can include each number in your list.

You need 2 * 2 * 3 * 5, or 60, to do the job. so LCM is 60.

60

More answers

The least common multiple of the numbers 20, 30 and 15 is 60.

The LCM is: 60

60

Q: What is the least common multiple of 15 and 30 and 20?

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