At least two fractions are needed to determine a common denominator.
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The lowest common denominator of 5/6 and 3/8 is 24.
The LCD of 3/4 and 4/5 is 20.
1 is the only common denominator.
A common denominator, though not the least, is 30.
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.