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Suppose the question is, what are the common multiples of 16 and 20? One way to answer this question is to start listing the multiples of each of the numbers and look for the numbers that are on both lists.

Multiples of 16 are 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, ...

Multiples of 20 are 20, 40, 60, 80, 100, 120, 140, 160, 180, ...

If we continued this list there would be more numbers in common. In fact, all multiples of 80 would be on both lists.

Therefore, the common multiples of 16 and 20 are 80, 160, 240, 320, 400, .... The Least Common Multiple is 80.

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12y ago

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