Question:
What is $0.8\overline{4}-0.\overline{4}$? Express your answer as a common fraction.

Answer:
Note that $0.8\overline{4} = 0.8 + 0.0\overline{4}$ and $0.\overline{4} = 0.4 + 0.0\overline{4}.$ Our expression becomes \begin{align*}
0.8\overline{4}-0.\overline{4} &= (0.8 + 0.0\overline{4}) - (0.4 + 0.0\overline{4}) \\
&= 0.8 + 0.0\overline{4} + (-0.4) + (-0.0\overline{4}) \\
&= [0.8 + (-0.4)] + [0.0\overline{4} + (-0.0\overline{4})] \\
&= 0.4 + 0 = 0.4.
\end{align*}The decimal number $0.4$, when expressed as a fraction, is $\frac{4}{10}=\boxed{\frac{2}{5}}.$