JSFiddle - React, Tailwind, and code Playground

JavaScript

function intelliRound(num) {
    var len=(num+'').length;
    var fac=Math.pow(10,len-1);
    return Math.ceil(num/fac)*fac;
}
alert(intelliRound(13));
alert(intelliRound(349));
alert(intelliRound(5645));