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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.


Common multiples of 21 and 49?

LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.


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This cannot be determined because the common multiples of any two or more numbers are infinite.


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The multiples of 24 are 24, 48, 72 and so on. The multiples of 40 are 40, 80, 120 and so on. The common multiples of 24 and 40 are 120, 240, 360 and so on.