I have 3 column in a table deduction,advance , total.
first two columns have their value from database and 3rd column is **sum of 1st two column**
**but** instead of summation i am getting result as **concatenated**.

```
<td data-title="'deduction>'">
   <span >{{payroll.deduction}}</span>
</td>
<td data-title="'advance''">
   <span >{{payroll.advance}}</span>
</td>
<td data-title="'total">
   <span >{{payroll.deduction+payroll.deduction}}</span>
</td>

```