At least two fractions are needed in order to determine a common denominator.
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The LCD of 5/8 and 5/6 is 24.
A common denominator is 32.
To subtract fractions, find a common denominator. The common denominator of 6 and 8 is 24. Therefore, five sixths is equivalent to twenty-fours sixths, and five eighths is equivalent to twenty-four eighths. Subtracting twenty-four eighths from twenty-four sixths gives an answer of three twenty-fourths.
24 1/3 = 8/24 5/8 = 15/24
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.