Calcul (nombres naturels)

$$\begin{array}{rrrrrr} & {\small\color{red}{}} & {\small\color{red}{8}} & {\small\color{red}{9}} & {\small\color{red}{16}}\\ & 9 & \color{gray}{9} & \color{gray}{0} & \color{gray}{6}\\ - & 2 & 4 & 8 & 8\\ \hline & 7 & 4 & 1 & 8\\ \end{array}$$

Nouvel exemple