Calcul (nombres naturels)

$$\begin{array}{rrrrrrr} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}} & {\small\color{orange}{}}\\ & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{}} & {\small\color{blue}{7}} & {\small\color{blue}{}} & {\small\color{blue}{1}}\\ & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{4}} & {\small\color{red}{}} & {\small\color{red}{1}}\\ & & & & & 8 & 0 & 2\\ \cdot & & & & & \color{orange}{1} & \color{blue}{9} & \color{red}{5}\\ \hline & & \color{red}{} & \color{red}{} & \color{red}{4} & \color{red}{0} & \color{red}{1} & \color{red}{0}\\ & & \color{blue}{} & \color{blue}{7} & \color{blue}{2} & \color{blue}{1} & \color{blue}{8} & \color{blue}{0}\\ + & & \color{orange}{} & \color{orange}{8} & \color{orange}{0} & \color{orange}{2} & \color{orange}{0} & \color{orange}{0}\\ \hline & & 1 & 5 & 6 & 3 & 9 & 0\\ \end{array}$$

Nouvel exemple