You need at least two things to find something in common between them.
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The lowest common denominator (or multiple) for a single number is the number itself. Usually it is more interesting to get the lowest common multiple for two or more numbers.
The lowest common denominator is 6
The lowest common multiple, or lowest common denominator, of 18 and 28 is 252.
The lowest common denominator would be twelve!
Lowest common denominator of 50 and 35 is 350.
The lowest common denominator of 30 and 42 is 210.