Polynomial- and Binary-Division
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A polynomial division writing in mathmode is possible with \underline{}, \hspace{} and use of eqnarray.
\begin{eqnarray*}
(x^{5}+x^{2}):(x^{3}+x^{2}) & = & x^{2}-x+1\\
\underline{{-(x^{5}+x^{4})}}\hspace{11ex}\\
-x^{4}+x^{2}\hspace{7ex}\\
\underline{{-(-x^{4}-x^{3})}}\hspace{6ex}\\
x^{3}+x^{2}\hspace{2ex}\\
\underline{{-(x^{3}+x^{2})}\hspace{1ex}}\\
0\hspace{5ex}
\end{eqnarray*}
with package polynom
this makes polynomial division very easy! For example
\polyset{style=B}\polylongdiv{x^3+x^2+x+1}{x-1}
For more information look at the doc, which comes with the package, which is available at CTAN or part of your local tex-installation!