Calcul (nombres naturels)

$$\begin{array}{rrrrrr} & {\small\color{red}{4}} & {\small\color{red}{10}} & {\small\color{red}{3}} & {\small\color{red}{15}}\\ & \color{gray}{5} & \color{gray}{0} & \color{gray}{4} & \color{gray}{5}\\ - & 4 & 8 & 1 & 9\\ \hline & 0 & 2 & 2 & 6\\ \end{array}$$

Nouvel exemple