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The least common multiple of 12, 18, and 30 is 180.

First break the number down into their prime factors:

12 = 22 x 3

18 = 2 x 32

30 = 2 x 3 x 5

To find the LCM (lowest common multiple) multiply all the prime factors in the lists together. However, primes occurring in moire than one list only have to be counted once.

So 2 x 2 x 3 x 3 x 5 = 180

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9y ago

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