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.
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Least Common Multiple (LCM) for 24 40 84 is 840.
The least common multiple is the smallest number that is multiple of two or more numbers. 24: 48, 72, 96, 120 40: 40, 80, 120 The LCM for 24 and 40 is 120.
The highest common factor is 8.
LCM of 24, 40, and 84 is 840. Just write out the multiples of each until you get to a common number.
The Least Common Multiple (LCM) for 40 32 36 is 1,440.