You need at least two numbers to find an LCM. IF that's 8 and 3, the LCM is 24.
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The least common multiple of 18, 36, and 54 is 108.
The least common multiple of 42 , 5 , 7 = 210
The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. If you have only one number - whether or not it is a prime - you cannot have a least COMMON multiple.
The greatest common multiple of any set of integers is infinite.
The least common multiple of 7 and 13 is 91. Because the numbers in the set are prime, their LCM is their product.