Calcul (nombres naturels)

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

Nouvel exemple