If that's 6/4 and 9/5, the least common denominator is 20.
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The LCM for 9, 5, 4, is: 180
The LCM of 4, 9, 5, and 7 is 1,260.
The Least Common Multiple (LCM) of 6, 9, and 5 is 90.
The LCM is 1260.
The LCM of 2, 3, 4, 5, 6, 9 and 10 is 180.