Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>The toString() method converts a number to a string.</p>

<p id="demo"></p>

<script>
var x = 123;
document.getElementById("demo").innerHTML =
    x.toString() + "<br>" +
   (123).toString() + "<br>" +
   (100 + 23).toString();
</script>

</body>
</html>