multiple of 7 = 7,14,21,28,35,42,49,56,63,70,77.......
multiple of 8 = 8,16,24,32,40,48,56,64,72,80,88..........
so the lcm of 7&8 is 56.
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lcm(2, 7) = 14 → first 3 common multiples are: 14, 28, 42; lcm(2, 8) = 8 → first 3 common multiples are: 8, 16, 24; lcm(7, 8) = 56 → first 3 common multiples are: 56, 112, 168; lcm(2, 7, 8) = 56 → first 3 common multiples are: 56, 112, 168.
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
The LCM is 504.
The LCM is 840.
LCM of 7 8 12 is 168.