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You need at least two numbers to find a common multiple.

Multiples of 21 in that range include 21, 42, 63 and 84

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10y ago
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10y ago

To have a common multiple you have to have two or more numbers, so there are no common multiples.The multiples of 21 between 1 and 100 are 21, 42, 63, 84.

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Q: How many common multiples of 21 are there between 1and100?
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