<!DOCTYPE html>
<html>
<body>
<p>The toPrecision() method returns a string, with a number written with a specified length:</p>
<p id="demo"></p>
<script>
var x = 9.656;
document.getElementById("demo").innerHTML =
x.toPrecision() + "<br>" +
x.toPrecision(2) + "<br>" +
x.toPrecision(4) + "<br>" +
x.toPrecision(6);
</script>
</body>
</html>