30
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The Least Common Multiple (LCM) of (3,7,10) is 210
Common denominators. These are called "common multiples". For example, multiples of 4 are: 4,8,12,16,20,24 ... . Multiples of 6 are: 6,12,18,24,30,36 ... . The numbers on both lists are the common multiples and they include: 12,24,36, ... . Specifically, the smallest number in any such list of common multiples (12 in this example) is known as the Least (or Lowest) Common Multiple or LCM.
It is 12
The LCM is 15. The rest are 30, 45, 60, 75 and 90.
They are: 24 48 and 72