Calcul (nombres naturels)

$$\begin{array}{rrrrrr} & {\small\color{red}{6}} & {\small\color{red}{9}} & {\small\color{red}{10}} & {\small\color{red}{11}}\\ & \color{gray}{7} & \color{gray}{0} & \color{gray}{1} & \color{gray}{1}\\ - & & 9 & 1 & 5\\ \hline & 6 & 0 & 9 & 6\\ \end{array}$$

Nouvel exemple