What is the lowest common multiple of 12 & 21?

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84.

Multiples of 12 include: 12, 24, 36, 48, 60, 72, 84, 96, 108, etc... Multiples of 21 include: 21, 42, 63, 84, 105, etc... The last base multiple among the two is 84. We can stay by dividing 84 by twain 12 and 21. The quotient in these equations should be ingredients of the unused multiple. For example: ##84/12=7## 7 is a ingredient of 21. ##84/21=4## 4 is a ingredient of 12.

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