function plusNum(arg1, arg2) { var r1, r2, m, n; try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 } try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 } m = Math.pow(10, Math.max(r1, r2)) n = (r1 >= r2) ? r1 : r2; return ((arg1 * m + arg2 * m) / m).toFixed(n); } console.log(plusNum(plusNum(4.32000001, 2.335), 3.4444))