\documentclass[a4paper,10pt]{classPres}

\usetikzlibrary{snakes}

\author{}
\title{}
\date{}

\begin{document}
\begin{frame}{Calcul mental}
    \begin{center}
        \huge 30 secondes par calcul
    \end{center}
\end{frame}

\begin{frame}{Calcul 1}
    \huge
    \begin{eqnarray*}
        5 \times 56 = 
    \end{eqnarray*}
\end{frame}

\begin{frame}{Calcul 2}
    \huge
    \[ 94 : 5 = \]
\end{frame}

\begin{frame}{Calcul 3}
    \LARGE
    5 sacs de beredjes coûtent 15\euro.

    Combien coûte un sac?
    
\end{frame}

\begin{frame}{Calcul 4}
    \huge
    Calculer l'aire de la figure
    \begin{center}
        \begin{tikzpicture}
            \filldraw[very thick, fill=blue!60] 
                    (-2,3) -- node[midway, sloped, below]{5cm}
                    (-2,0) -- node[midway, below]{2cm}
                    (0,0) -- 
                    (0,1) -- node[midway, below]{4cm}
                    (3,1) -- node[midway, rotate=-90, above]{3cm}
                    (3,3) -- 
                    cycle;
                    \draw[dotted, very thick] (0,1) -- (0, 3);

        \end{tikzpicture}
    \end{center}
\end{frame}

\begin{frame}{Fin}
    \begin{center}
        \huge On retourne son papier.
    \end{center}
\end{frame}


\end{document}