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Prime factor each number then use the prime the most it was used in any one number.

7=7

-9=3x3

12=2x2x3

2x2x3x7=84 We usually ignore the negative when finding the LCM.

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13y ago

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Wiki User

12y ago

The LCM of these numbers is 252.

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Wiki User

10y ago

2772

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Q: What is the least common multiple of 12 11 7 and 9?
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