A common denominator, though the least, is 240.
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The least common denominator of the fractions 2/8, 10/11 and 2/3 is: 264.
The Least Common Denominator of 3/4 and 7/8 is 8.
The lowest common denominator of 5/6 and 3/8 is 24.
It is 168
Your common denominator is 10, so that is 2 8/10 + 3 5/10 = 5 13/10, which reduces to 6 3/10.