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42 - 24 = 18
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The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90.
The GCF of 18 and 42 is 6. The GCF of 42 and 56 is 14.