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There is an infinite number of common multiples for 21 and 40. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).

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Q: What are the common multiples of 21 and 40?
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What are the common multiples of 40?

Multiples of 40 include 40, 80, 120 and so on. For them to be common, they need to be compared to another set of multiples.


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