Question:
What is $.0\overline{3} \div .\overline{03}$? Express your answer as a mixed number.

Answer:
It is almost always easier to use fractions than decimals when dividing. So the first task is to convert these repeating decimals to fractions. First, $.0\overline{3}$: \[
10 \cdot .0\overline{3} = .\overline{3} = \frac{1}{3}\\
\Rightarrow .0\overline{3} = \frac{1}{3} \div 10 = \frac{1}{3} \cdot \frac{1}{10} = \frac{1}{30}.
\]Next, $.\overline{03}$: \[
99 \cdot .\overline{03} = (100-1) \cdot .\overline{03} = 3.\overline{03} - .\overline{03} = 3\\
\Rightarrow .\overline{03} = \frac{3}{99} = \frac{3}{3 \cdot 33} = \frac{1}{33}.
\]We now have the tools to make our calculation: \begin{align*}
.0\overline{3} \div .\overline{03} &= \frac{1}{30} \div \frac{1}{33}= \frac{1}{30} \cdot \frac{33}{1}\\
&= \frac{33}{30} = \frac{3 \cdot 11}{3 \cdot 10} = \frac{11}{10}\\
&= \frac{10+1}{10} = \boxed{1\frac{1}{10}}.
\end{align*}