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The LCM of 7 and 21 is 21. Since 7 is a factor of 21, the LCM is automatically 21.
21 is.

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7y ago

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Wiki User

14y ago

The lowest common multiple of 21 and 7 is 147.

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10y ago

The least common multiple of the numbers 21 and 7 is 21.

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Wiki User

13y ago

L.C.M. of 7 and 21: 21

Multiples of 7: 7, 14, 21, 28, 35, 42,...

Multiples of 21: 21, 42, 63, 84,...

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Q: What is the least common multiple of 7 and 21?
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