Express the following as a recurring decimal :

$\dfrac{17}{90}$

By actual division, we get:

$\begin{array}{r} 0.188… \ 90 \overline{\smash{)} 17.000 } \ \underline{90} \phantom{.00} \ 800 \phantom{.0} \ \underline{720} \phantom{.0} \ 800 \phantom{} \ \underline{720} \phantom{} \ 80 \phantom{} \end{array}$

∴ $\dfrac{17}{90} = 0.188… = 0.1\overline{8}$