http://tug.org/PSTricks/main.cgi/USEPACKAGE: $string .= "\usepackage{pst-all}\n";
\begin{align*}
1180 &= 2 \times \rnode{A}{482} + \rnode{B}{216} \\ \\
\rnode{C}{482} &= 2 \times \rnode{D}{216} + \rnode{E}{50} \\ \\
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{A}{C}
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{B}{D}
\rnode{F}{216} &= 4 \times \rnode{G}{50} + \rnode{H}{16} \\ \\
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{D}{F}
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{E}{G}
\rnode{I}{50} &= 3 \times \rnode{J}{16} + \rnode{K}{2} \\ \\
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{G}{I}
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{H}{J}
\rnode{L}{16} &= 7 \times \rnode{M}{\boxed{2}} + 0
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{J}{L}
\ncdiag[angleA=-90,angleB=90,arm=.4,linearc=.3]{->}{K}{M}
\end{align*}
