The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.
The least common multiple of 9, 20, 40, and 42 is 2520.
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The least common multiple of 42 , 5 , 7 = 210
The LCM of 6, 9, and 42 is 126
252
The least common multiple of 9 , 1 = 9
The least common multiple of 4 and 9 is 36.36