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+\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}
+\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}