diff --git a/notebook_de_prueba_clas4.ipynb b/notebook_de_prueba_clas4.ipynb
index 9e38a3a086c31cabb3125de02957e93d75bc2fef..5f5d85ce94ad0497e151634e5f510adc1e3f6b1a 100644
--- a/notebook_de_prueba_clas4.ipynb
+++ b/notebook_de_prueba_clas4.ipynb
@@ -20,6 +20,26 @@
     "5*3\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "8"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "4+4\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,