The least common multiple (LCM) is: 120
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120.
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
The lowest common multiple is 24.
The LCM (Least Common Multiple) of 24 and 120 is the smallest number that is a multiple of both 24 and 120, which is 120. The GCF (Greatest Common Factor) of 24 and 120 is the largest number that divides both 24 and 120 without leaving a remainder, which is 24.