LCD(100, 8) = 200
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16 is the answer you're looking for. If you have two fractions with denominators of 8 & 16, then 16 is the Least Common Multiple of the two denominators.
8/9, 5/12, 6/7
You need at least two denominators to find something in common between them.
The Least Common Multiple (LCM) for 6 8 9 is 72.
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.