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The multiples of 20 are: 20, 40, 60, 80, 100, 120, 140, etc ...The multiples of 30 are: 30, 60, 90, 120, 150, etc ...The multiples of 40 are: 40, 80, 120, 160, etc. ...The lowest multiple common to 20, 30, and 40 is 120, so the LCM = 120
The LCM of 45, 30, and 15 is 90 Hope that helped:)
The least common multiple of the numbers 8, 60 and 40 is 120.
The least common multiple of the numbers 30, 40 and 70 is 840.