<form>
<div>First Number:</div>

<div>  <input type="number" id="num1" /></div>

<div>Second Number:</div>

<div>   <input type="number" id="num2" /></div>

<div><input type="button" value="Calculate Sum" onclick="sumNumbers()"/></div>
<div>Result:</div>
<div> <input type="number" id="result" /></div>

</form>

<script>
function sumNumbers() {
    let num1 = document.getElementById('num1');
    let num2 = document.getElementById('num2');
    let sum = Number(num1) + Number(num2);
    document.getElementById('result').innerHTML = sum;
}</script>