90 is the least common multiple of 5, 9, 18, and 3.
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The Least Common Multiple (LCM) for 3 18 30 is 90.
I believe that would be 18. 18 is evenly divisible by all three of those numbers.
So the least common multiple means what they both multiply to get the same value. Unfortunately 48 doesn't go into 18, so we multiply that by 2. 96 still doesn't go into 18, so we multiple "48" by 3, 144 does go into 18. So 144 is your least common multiple.
Least Common Multiple (LCM) for 46 3 is 138
The Least Common Multiple of 3, 11, and 22 is 66.