I can't find the wrong code on line 23
<p>I can't find the wrong code on line 23.</p>

<pre><code>&lt;html&gt;
&lt;head&gt;&lt;title&gt;cw5&lt;/title&gt;&lt;/head&gt;
&lt;body&gt; 
&lt;form method=post&gt;
Please enter 2 numbers: &lt;br&gt;
The first number: &lt;input type="text" name="num1"&gt;&lt;br&gt;
The second number: &lt;input type="text" name="num2"&gt;&lt;br&gt;
&lt;input type="submit" value="Submit"&gt;&lt;/form&gt;&lt;hr&gt;
&lt;?php 
   $num=$_POST["num1"]+$_POST["num2"];
   echo $_POST['num1']."+".$_POST['num2']."=".$num."&lt;br&gt;";

   $num2=$_POST["num1"]-$_POST["num2"];
   echo $_POST['num1']."-".$_POST['num2']."=" .$num2."&lt;br&gt;";

   $num3=$_POST["num1"]*$_POST["num2"];
   echo $_POST['num1']."x".$_POST['num2']."=" .$num3."&lt;br&gt;";

   $num4=$_POST["num1"]/$_POST["num2"];
   echo $_POST['num1']."/".$_POST['num2']."=" .$num4."&lt;br&gt;";

   $num5=$_POST["num1"]%$_POST["num2"];
   **echo "the remains of" $_POST['num1']."/".$_POST['num2']. "is".$num5."&lt;br&gt;";**
?&gt;
&lt;hr&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>
