Calcul (nombres naturels)

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

Nouvel exemple