Oh, dude, the common denominator for 4, 2, and 9 is like the smallest number that all three can divide evenly into. So, in this case, the common denominator would be 36 because 4, 2, and 9 can all divide evenly into 36. Math can be chill sometimes, right?
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9 is the common denominator. 2/3 = 6/9.
The Least Common Multiple is the multiple that is common to all four of the numbers. The LCM of 4, 10, 2, and 9 is 180.
1
36
LCD(4, 9) = 36.