Write out the multiples of each:
30, 60, 90, 120
40, 80, 120.
120 is the first that appears in both and this is your LCM
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The LCM is 360.
The Least Common Multiple (LCM) for 30 20 40 is 120.
The LCM is: 120
The LCM is: 120
The Least Common Multiple (LCM) for 30 40 50 is 600.