<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

    <form action="add" method="get">

        Enter 1st number: <input type="text" name="num1"> <br>
        Enter 2nd number: <input type="text" name="num2"> <br>
        <input type="submit">
    </form>
</body>
</html>