There is not a least common multiple of a single number, such as 12, because there cannot be a least common multiple without two or more numbers to compare. Common multiples are multiples that the numbers being compared have in common. The least common multiple is the smallest multiple that all the numbers being compared have in common.
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It is not possible to give a sensible answer to this question. The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question!
The least common multiple (LCM) of 5 and 12 is 60.
The least common multiple of 12 , 15 , 36 is 180
The least common multiple of 4, 12, and 32 is 96.
The Least Common Multiple of 12, 18, and 30 is 180.
The least common multiple of 12, 20 and 24 is 120.