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In order to find the LCM, you first split the two numbers into their factors:
15 is 5x3
12 is 3x2x2
Then you ignore any duplicate factors. In this case 3 is a factor of both, so we only need to count 3 once. We're left with 5,3,2 and 2.
Multiply all these numbers together to get the LCM of 15 and 12:
5x3x2x2=60
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