24, I would guess.
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5/6 + 1/8 First change to common denominator. 20/24 + 3/24 Now add the numerators, and put the result over the common denominator. 20+3=23 23/24 is the answer.
A common denominator, though not the least one, is 24*21 = 504.
11 over 24 (11/24) Here's how: You need to find a common denominator. The lowest common denominator is 24, but you can use any common denominator to subtract. So convert 5/6 to 24ths: multiply numerator and denominator by 4 = 20/24, then multiply numerator and denominator of 3/8 by 3 = 9/24. Now subtract 9 from 20 = 11, which is the numerator of the difference: 11/24. This is already in simplest form.
24 + 24 + 23 + 24 = 95
There can be no greatest common denominator. For supose x is the greatest common denominator. ie 24 divides x and 36 divides x. Then 2x is a common denominator and 2x > x so 2x is a greater common denominator than the greatest common denominator. That contradiction implies that there is no greatest common denominator.