试图划分一个字符串

I am pulling information from my table. It is setup as a varchar. I can't change it because it 0's everything out when I do. I need to be able to divide the result by 12. It is the MY-TotalPrem that needs to be divided.

I tried

<td>'.$row["MS-TotalPrem" / 12].'
</td>, <td>'.$row["MS-TotalPrem"] / 12.'</td>, 
<td>'.$row[int("MS-TotalPrem") / 12].
'</td>

and none work.

function fetch_customer_data($connect)
{
 $query = "SELECT * FROM mytable";
 $statement = $connect->prepare($query);
 $statement->execute();
 $result = $statement->fetchAll();
 $output = '
 <div class="table-responsive">
  <table class="table table-striped table-bordered">
   <tr>
    <th>Name</th>
    <th>Address</th>
    <th>Address</th>
    <th>Policy Number</th>
    <th>Total Monthly</th>
    <th>Expiration Date</th>
   </tr>
 ';
 foreach($result as $row)
 {
  $output .= '
   <tr>
    <td>'.$row["AC-AcctName"].'</td>
    <td>'.$row["PM-PropertyAddr1"].'</td>
    <td>'.$row["PO-Addr1"].'</td>
    <td>'.$row["PO-PrefixPolNum"].'</td>
    <td>'.$row["MS-TotalPrem"].'</td>
    <td>'.$row["PO-ExpDate"].'</td> 
   </tr>
  ';
 }
 $output .= '
  </table>
 </div>
 ';
 return $output;
}

I just want the output to be a division of 12, or any other number I put in. Thank you.

function fetch_customer_data($connect)
{
 $query = "SELECT * FROM mytable";
 $statement = $connect->prepare($query);
 $statement->execute();
 $result = $statement->fetchAll();
 $output = '
 <div class="table-responsive">
  <table class="table table-striped table-bordered">
   <tr>
    <th>Name</th>
    <th>Address</th>
    <th>Address</th>
    <th>Policy Number</th>
    <th>Total Monthly</th>
    <th>Expiration Date</th>
   </tr>
 ';
 foreach($result as $row)
  $output .= '
   <tr>
    <td>'.$row["AC-AcctName"].'</td>
    <td>'.$row["PM-PropertyAddr1"].'</td>
    <td>'.$row["PO-Addr1"].'</td>
    <td>'.$row["PO-PrefixPolNum"].'</td>
    <td>'.($row["MS-TotalPrem"] / 12).'</td>
    <td>'.$row["PO-ExpDate"].'</td> 
   </tr>
  ';

 $output .= '
  </table>
 </div>
 ';
 return $output;
}