The LCM of 51 and 80 is 4080
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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.
510
The GCF is 3 The LCM is 4,590
102