Form:Test calculation form

<form>

 <input name="num1" type="number" placeholder="Enter number 1" />
 <select name="operation">
   <option value="add">+</option>
   <option value="subtract">-</option>
   <option value="multiply">*</option>
   <option value="divide">/</option>
 </select>
 <input name="num2" type="number" placeholder="Enter number 2" />
 <input type="submit" value="Calculate" />
 

</form>