Calcul (nombres naturels)

$$\begin{array}{rrrrrr} & {\small\color{red}{7}} & {\small\color{red}{13}} & {\small\color{red}{}} & {\small\color{red}{}}\\ & \color{gray}{8} & \color{gray}{3} & 5 & 9\\ - & 2 & 9 & 1 & 6\\ \hline & 5 & 4 & 4 & 3\\ \end{array}$$

Nouvel exemple