\documentclass[a4paper,10pt]{classPres}
\usepackage{tkz-fct}

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

\begin{document}
\begin{frame}{Questions flashs}
    \begin{center}
        \huge 30 secondes par calcul
    \end{center}
\end{frame}

\begin{frame}{Calcul 1}
    \huge Maximum de 
    \[
        -3 \qquad -42 \qquad -10
    \]
\end{frame}

\begin{frame}{Calcul 2}
    \huge 
    Réduire l'expression
    \[
        10x + 3 - 5x - 1 = 
    \]
\end{frame}

\begin{frame}{Calcul 3}
    \huge
    \[
        4\times5 - 2\times9 = 
    \]
\end{frame}

\begin{frame}{Calcul 4}
    \huge
    Combien vaut les $\dfrac{3}{4}$ de 8\euro?    
    \begin{center}
        \begin{tikzpicture}[scale=2]
            \foreach \x in {1,...,4} {%
                \draw (\x,0) circle (0.4cm) node {1\euro};
                \draw (\x,1) circle (0.4cm) node {1\euro};
            }
        \end{tikzpicture}
    \end{center}
\end{frame}

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


\end{document}