The Least Common Denominator of 3/4 and 7/8 is 8.
The least common denominator is 280.
A common denominator, though not the least, is 63000.
56
The least common denominator of 6,7, and 8 is the least common multiple of those numbers. This is 168.
280
It is: 1008
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40
LCD(5, 8, 7) = 280
It is: 840
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.