\documentclass[a4paper,10pt]{classPres}

\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*}
        2\times ... + 4 = 10
    \end{eqnarray*}
\end{frame}

\begin{frame}{Calcul 2}
    \huge
    Calculer avec la formule quand $x = 2$
    \[ F = x + 3 + 5x \]
\end{frame}

\begin{frame}{Calcul 3}
    \huge
    Réduire
    \begin{eqnarray*}
        5x\times3 + 4\times3 - 4x = 
    \end{eqnarray*}
    
\end{frame}

\begin{frame}{Calcul 4}
    \huge
    Quelle est la probabilité de tirer une boule bleu ?
    \begin{center}
        \Ovalbox{
            \begin{tikzpicture}[scale=1.4]
                \draw[fill=red] (0,0) circle (0.4) node {$1$}; 
                \draw[fill=red] (1,0) circle (0.4) node {$2$}; 
                \draw[fill=red] (2,0) circle (0.4) node {$10$}; 
                \draw[fill=red] (3,0) circle (0.4) node {$10$}; 
                \draw[fill=green] (0,1) circle (0.4) node {$1$}; 
                \draw[fill=green] (3,1) circle (0.4) node {$1$}; 
                \draw[fill=blue] (0,2) circle (0.4) node {$10$}; 
                \draw[fill=blue] (3,2) circle (0.4) node {$2$}; 
                \draw[fill=blue] (0,3) circle (0.4) node {$1$}; 
                \draw[fill=blue] (1,3) circle (0.4) node {$2$}; 
                \draw[fill=blue] (2,3) circle (0.4) node {$10$}; 
                \draw[fill=blue] (3,3) circle (0.4) node {$10$}; 
                \draw[fill=white] (1.5,1.5) circle (0.4) node {$50$}; 
            \end{tikzpicture}
        }
    \end{center}
\end{frame}

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


\end{document}