\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*}
        58 + 0,07 + 6,05 = 
    \end{eqnarray*}
\end{frame}

\begin{frame}{Calcul 2}
    \huge
    \[ 4 \times .... = 32 \]
\end{frame}

\begin{frame}{Calcul 3}
    \huge
    \[ 22 : 5 = \]
    
\end{frame}

\begin{frame}{Calcul 4}
    \huge
    Calculer l'aire de la figure
    \begin{center}
        \begin{tikzpicture}
            \filldraw[very thick, fill=blue!60] (-3,3) -- (-3,0) -- (4,0) -- (4,3) -- cycle;
            \draw[step=1] (-5,-1) grid (5,5);

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

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


\end{document}