There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
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What would be the ideal Common Denominator for 2 and 4?
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The least common denominator of 6,7, and 8 is the least common multiple of those numbers. This is 168.
60 is the least common denominator of 3 4 5 6 10 and 15.