This cannot be answered properly because at least two numbers are required.
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the common denominator for 9/8 and 7/20 is 40. (45/40 and 14/40)
LCD(3, 40) = 120
The least common denominator is 1. The greatest common denominator is 2. The least common multiple is 1,218.
The least common denominator is 3x.
The least common denominator (LCD) is 1.