There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions. Even if you converted your numbers (x) to their fraction equivalents (x/1), the LCD will always be 1.
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Denominator of seven eights, ie of fifty six is 1. The denominator of five sixths is 6 so the common denominator is 6.
168 is the least common multiple of 56 and 84
6 5/9 = 59/9Multiply the 6 by the nine in the denominator and add it to 5 in the numerator.
Neither, six times nine is fifty four.
To subtract two fractions, they must have a common denominator. In this case, the common denominator is 9. So, convert 2/3 to 6/9. Then, subtract 6/9 - 4/9 to get 2/9 as the result.