Calcul (nombres naturels)

$$\begin{array}{rrrrrrr} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{3}} & {\small\color{orange}{}}\\ & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}}\\ & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{1}} & {\small\color{red}{}}\\ & & & & 1 & 8 & 0\\ \cdot & & & & \color{orange}{4} & \color{blue}{1} & \color{red}{2}\\ \hline & & \color{red}{} & \color{red}{} & \color{red}{3} & \color{red}{6} & \color{red}{0}\\ & & \color{blue}{} & \color{blue}{1} & \color{blue}{8} & \color{blue}{0} & \color{blue}{0}\\ + & & \color{orange}{7} & \color{orange}{2} & \color{orange}{0} & \color{orange}{0} & \color{orange}{0}\\ \hline & & 7 & 4 & 1 & 6 & 0\\ \end{array}$$

Nouvel exemple