JSFiddle - React, Tailwind, and code Playground

HTML

<span id="num1"></span>
<span id="num2"></span>
<span id="num3"></span>

CSS

span {
    border: 1px solid #000;
    margin: 5px;
    padding: 5px;
}

JavaScript

var num1 = "1";
document.getElementById('num1').innerHTML = parseFloat(Math.round(num1 * 100) / 100).toFixed(2);

var num2 = "1.341";
document.getElementById('num2').innerHTML = parseFloat(Math.round(num2 * 100) / 100).toFixed(2);

var num3 = "1.345";
document.getElementById('num3').innerHTML = parseFloat(Math.round(num3 * 100) / 100).toFixed(2);