1/9 + 5/6 least multiple that is the same add using renamed fractions

First, least common multiple must be found. To do this the numerator and denominator of 1/9 must be multiplied by 2 and the numerator and denominator of 5/6 must be multiplied by 3 to give 2/18 + 15/18. Then the two fractions (2/18 and 15/18) can be added together to give 17/18. Final 17/18.

The number that belongs in the space labeled (X) is 10.