Since, in its decimal expansion, you'd have
[tex]\dfrac{10}{12}=\dfrac{5}{6}=0.833333\ldots[/tex]
We use the bar symbol over the digits that repeat indefinitely, so, in this case, we'll write a single "3" with an overbar:
[tex]\dfrac{10}{12}=0.8\overline{3}[/tex]
