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The least common multiple (LCM) of two numbers is the smallest positive rational number (not zero) that is a multiple of both.

Multiples of 14 are:

14, 28, 42, 56, etc.

Multiples of 21 are:

21, 42, 63,etc.

The least common multiple of 14 and21 is the smallest one of those: 42

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Q: What is the least common multiple 21 and 14?
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