\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
    \[
        87 \times 4 =
    \]
\end{frame}

\begin{frame}{Calcul 2}
    \huge
    Comment est l'angle $\widehat{AOC}$?
    \begin{center}
        \begin{tikzpicture}[scale=1.4]
            \draw (0.6, 0.3) node {O};
            \foreach \angle/\letter in {0/A, 1/B, 2/C, 3/D, 4/E, 5/F, 6/G, 7/H}
            {
                \draw [very thick] (0, 0) -- ({\angle*45}: 2) node {x} node[above right] {\letter} -- ({\angle*45}: 2.3);
            }
        \end{tikzpicture}
    \end{center}
\end{frame}

\begin{frame}{Calcul 3}
    \LARGE
    Compléter la valeur manquante

    \begin{center}
        \begin{tabular}{|c|*{2}{p{2cm}|}}
        \hline
        Nombre de sacs & 1 & 10 \\
        \hline
        Prix & ... & 5 \\
        \hline
    \end{tabular}
    \end{center}
\end{frame}

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

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


\end{document}