The LCM is: 18
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30
Only one can be least. That's 42. The next two are 84 and 126.
It is 12
They are: 24 48 and 72
All numbers have multiples. Some numbers have some of the same multiples as other numbers. These are known as common multiples. The smallest of these is known as the least common multiple. Common multiples of 3 and 4 include 12, 24, 36 and so on. The LCM of 3 and 4 is 12.