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The LCM of 51 and 80 is 4080
The least common multiple of 55 and 80 is 880.
You can't do the LCM of 400 because you need two numbers to do the LCM of, for example, the LCM of 12 and 8 would be 24.
The LCM of 9, 8 and 27 is 216
LCM(27, 24) = 216.