Calcul (nombres naturels)

$$\begin{array}{rrrrrr} & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{}} & {\small\color{red}{}}\\ & 3 & 2 & 9 & 9\\ - & 3 & 2 & 5 & 1\\ \hline & 0 & 0 & 4 & 8\\ \end{array}$$

Nouvel exemple