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There is no limit to the amount of common multiples. Numbers are infinite. If you take an example of a common multiple such as 360 then you can just keep adding noughts to it forever ie 3600 36000 etc and i'ts still a common multiple of 15 and 18.

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Q: What are the highest common multiples of 15 and 18?
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All multiples of 90.


What is the highest common multiple of 15 and 18?

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