Calcul (nombres naturels)

$$\begin{array}{rrrrrrr} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{2}} & {\small\color{orange}{1}}\\ & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}}\\ & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{1}} & {\small\color{red}{4}} & {\small\color{red}{3}}\\ & & & & & 2 & 5 & 4\\ \cdot & & & & & \color{orange}{4} & \color{blue}{0} & \color{red}{9}\\ \hline & & \color{red}{} & \color{red}{} & \color{red}{2} & \color{red}{2} & \color{red}{8} & \color{red}{6}\\ & & \color{blue}{} & \color{blue}{} & \color{blue}{0} & \color{blue}{0} & \color{blue}{0} & \color{blue}{0}\\ + & & \color{orange}{1} & \color{orange}{0} & \color{orange}{1} & \color{orange}{6} & \color{orange}{0} & \color{orange}{0}\\ \hline & & 1 & 0 & 3 & 8 & 8 & 6\\ \end{array}$$

Nouvel exemple