This cannot be answered because the common multiples of any two or more numbers are infinite.
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The LCM is: 72The lowest common multiple of 8 and 18 is 72
The Least Common Multiple (LCM) for 7 8 9 12 18 is 504.
There is no highest common multiple of any two or more numbers, for whatever value you come up with I can always add the LOWEST common multiple of the numbers to get an even higher common multiple. If you meant LOWEST common multiple, then LCM(8, 12, 16) = 48 If you mean the highest common FACTOR (the largest integer that divides into all the numbers) then HCF(8, 12, 16) = 4
infinite. every number has multiples that go out infinitely so their common multiple is infinite.
The Least Common Multiple (LCM) of 18, 16, and 8 is 144.