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Least Common Multiple (LCM) for 24 40 84 is 840.
It is: 1120
2520. 84 = 22 x 3 x 7 360 = 23 x 32 x 5 lcm = 23 x 32 x 5 x 7 = 2520
The LCM of 16 and 40 is 80 16: 16, 32, 48, 64, 80 40: 40, 80, 120, 160, 200
LCM of 24, 40, and 84 is 840. Just write out the multiples of each until you get to a common number.