diff --git a/08_calculator/solution/calculator-solution.js b/08_calculator/solution/calculator-solution.js
index 43af44f..b195387 100644
--- a/08_calculator/solution/calculator-solution.js
+++ b/08_calculator/solution/calculator-solution.js
@@ -6,12 +6,12 @@ const subtract = function (a, b) {
   return a - b;
 };
 
-const sum = function (...args) {
-  return args.reduce((sum, curr) => sum + curr, 0);
+const sum = function (array) {
+  return array.reduce((total, current) => total + current, 0);
 };
 
-const multiply = function(...args){
-  return args.reduce((product, curr) => product * curr)
+const multiply = function (array) {
+  return array.reduce((product, current) => product * current)
 };
 
 const power = function (a, b) {