126
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42
210
First, find the greatest common factor (GCF). 18 factors to [2 3 3] 42 factors to [2 3 7] Common factors [2 3] GCF = 6 Now, multiply them together and divide by the GCF to get the LCM. 18 * 42 / 6 = 126 ■
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.
The greatest common denominator of any set of denominators is infinite.