The LCM for the numbers 12 and 15 is: 60
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The LCM=60
The LCM of 15 and 12 is 60.
The LCM of 12, 15, and 45 is 180. The 15 can be ignored since it is already a factor of 45, next you break down the remaining numbers into their prime factors. 12= 2x2x3 45=3x3x5 You can eliminate 1 of the 3's since it is already a common actor between them So then 2x2x3x3x5=180
3 and 60, respectively.
LCM of 2 and 3 and 4 is 12.