answer: 30
explanation:
an LCM, the least common multiple, is the smallest multiple of each number that is a multiple of both numbers.
let's list the multiples of each number and see whichever one is the first to appear for both numbers:
multiples of 6: 6, 12, 18, 24, 30...
multiples of 15: 15, 30, 45, 60, 75...
see a common number? well, there is one. the number 30 is the first one to pop up for each number, so that makes it our lcm.
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