<html>
<body>
<p>Click the button to display the fixed number.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var num = 5.56789;
var n = num.toFixed(10);
document.getElementById("demo").innerHTML = n;
}
</script>
</body>
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</html>