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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

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13y ago

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