The Least Common Multiple (LCM) for 4 6 9 20 is 180.
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LCD(4, 9, 6, 20) = 180
LCM(4, 6, 7, 9) = 252
The LCM is 36.
180 Here's how to work it out 20 = 2x2x5 9 = 3x3 6 = 2x3 The answer has to have 2x2x5x3x3 (that includes, 20, 9 and 6) = 180
The LCM of 4 and 9 is 36.