The LCM is 126.
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The Least Common Multiple (LCM) for 7 8 9 12 18 is 504.
The common multiple of 4, 9, and 18 is 36.
As 18 = 9 x 2 then 18 is a multiple of 9 so the Least Common Multiple is 18!
The Least Common Multiple (LCM) for 7 9 is 63.
90 is the least common multiple of 5, 9, 18, and 3.