5 10 15 20... Basically any # with a 5 or 0 at the end of the #
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I suppose you could say that the highest common multiple is infinity since there are an infinite number of common multiples. If you give a specific number as the highest common multiple, you can always find a larger one.
I suppose the greatest common multiple could be considered as infinity. Once you calculate the least common multiple, you could keep doubling it forever. You could never determine a greatest common multiple, because every time you decided on a number, you could double it or multiply it by another positive integer, and have an even larger common multiple. There are an infinite number of common multiples.
Out of the list of common factors, choose the ones that end in zero.
Any number pair that includes two consecutive multiples of 8. This could be as high as you like. But theres many examples like 16 and 24 yes there is many but be sure to do the work.
It is: 72