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

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Q: What is the greatest common multiple of 21 and 40?
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The greatest common multiple of any set of integers is infinite.


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Why is 1 the greatest common factor of 21 and 40?

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What are the greatest common factors of 21 and 40?

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What is the least common multiple of 21 and 43?

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What is the greatest common multiple of 40 56?

There is no greatest common multiple: for whatever value you say is the greatest I can always add their lowest common multiple (for 40 and 56 it is 280) and get an even greater common multiple.There is a greatest common FACTOR or a LOWEST common multiple:gcf(40, 56) = 8lcm(40, 56) = 280Using the factorisation method:40 = 2³ x 556 = 2³ x 7hcf = 2³ = 8lcm = 2³ x 5 x 7 = 280


What are the greatest common factor of 21 and 40?

The GCF is 1.