SOLUTION
We want to add 1/3 with -5/6, we have
[tex]\begin{gathered} \frac{1}{3}-\frac{5}{6} \\ 6\text{ is the lowest common multiple, so 6 is the common denominator } \\ =\frac{2-5}{6},\text{ that is 6 divides 3, we get 2, then mutiplied by 1, we get 2} \\ 6\text{ divides 6, we get 1, then multiplied by 5, we get 5} \\ =\frac{2-5}{6} \\ =-\frac{3}{6} \\ =-\frac{1}{2} \end{gathered}[/tex]Hence the answer is -1/2
This point should be at the center of -1 and 0.
