5/12 + 1/9 = what?
$$\left({\frac{{\mathtt{5}}}{{\mathtt{12}}}}\right){\mathtt{\,\small\textbf+\,}}\left({\frac{{\mathtt{1}}}{{\mathtt{9}}}}\right) = {\frac{{\mathtt{19}}}{{\mathtt{36}}}} = {\mathtt{0.527\: \!777\: \!777\: \!777\: \!777\: \!8}}$$