http://de.wikipedia.org/wiki/Vors%C3%A4tze_f%C3%BCr_Ma%C3%9Feinheiten
$${\frac{{\mathtt{6\,486}}}{{\mathtt{13}}}} = {\mathtt{498.923\: \!076\: \!923\: \!076\: \!923\: \!1}}$$
$$\left({\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{3}}}{{\mathtt{4}}}}\right){\mathtt{\,\small\textbf+\,}}\left({\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{2}}}}\right) = {\frac{{\mathtt{29}}}{{\mathtt{4}}}} = {\mathtt{7.25}}$$
$$\left({\mathtt{5}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{3}}}}\right){\mathtt{\,\times\,}}\left({\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{3}}}{{\mathtt{4}}}}\right){\mathtt{\,-\,}}{\frac{\left({\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{1}}}{{\mathtt{2}}}}\right)}{\left({\frac{{\mathtt{2}}}{{\mathtt{5}}}}\right)}} = {\frac{{\mathtt{7}}}{{\mathtt{6}}}} = {\mathtt{1.166\: \!666\: \!666\: \!666\: \!666\: \!7}}$$