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There is really no such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.

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8y ago
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7y ago
The greatest common multiple of any set of integers is infinite.
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Q: What is the greatest common multiple for 15 and 40?
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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


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