Screen shot
Route

Route::get('input','InsertDataModel@input');
Route::post('add_number','InsertDataModel@add_number');

Controller

<?php

namespace AppHttpControllers;

use IlluminateHttpRequest;
use DB;
use AppHttpRequests;
use AppHttpControllersController;
use AppmodelsStudent;

class InsertDataModel extends Controller {
public function input(){
return view('user_form');
}

public function add_number(Request $request){
$number1 = $request->input('number1');
$number2 = $request->input('number2');
$number3 = $number1+$number2;
echo $number3;
}

}

View

<html>
<head>
<title>User Input Form</title>
</head>
<body>
<form name="frm" action="add_number" method="post">
<input type = "hidden" name = "_token" value = "<?php echo csrf_token() ?>">
<table>
<tr>
<td>Number 1</td>
<td><input type = "text" name = "number1" /></td>
</tr>
<tr>
<td>Number 2</td>
<td><input type = "text" name = "number2" /></td>
</tr>
<tr>
<td colspan = "2" align = "center">
<input type = "submit" value = "Submit" />
</td>
</tr>
</table>
</form>
</body>
</html>

You can download source code here