Highest common multiple of 24 and 18 is 6.
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There is no highest common multiple. Whatever common multiple you come up with as being their highest common multiple, I can always add their lowest common multiple (120) to get a higher common multiple.
The lowest common multiple (LCM) is: 72
6.
The Least Common Multiple (LCM) for 10 18 24 is 360.
2?