There are many common multiples of 120 and 149. A common multiple is simply a multiple of both numbers. The least common multiple is 120x149, since 149 is prime.
(Note: this trick doesn't work on all pairs of number. Although the product is always a multiple, it's not the least common multiple.)
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Least Common Multiple (LCM) for 12 120 is 120
The least common multiple of 80 and 120 is 240.
Least Common Multiple (LCM) for 100 120 is 600
To find the least common multiple, you need two terms. For example, the least common multiple of 120 and 5 would be 600 and the least common multiple of 120 and 16 would be 240. With one term, there is no least common multiple.
The least common multiple of 50 , 72 , 120 = 1,800