JSFiddle - React, Tailwind, and code Playground

JavaScript

var numbers = [83];

function weird_round(a) {
    var len = a.toString().length;
    var div = len == 1 ? 1 : Math.pow(10, len - 2);
    return Math.ceil(a / 10 / div) * div * 10;
}

alert(numbers.map(weird_round));