diff --git a/src/main/java/calculator/Calculator.java b/src/main/java/calculator/Calculator.java
index 4ab41f8..83876c6 100644
--- a/src/main/java/calculator/Calculator.java
+++ b/src/main/java/calculator/Calculator.java
@@ -2,7 +2,7 @@
 
 public class Calculator {
   public static double add(double x, double y) {
-    return x + y;
+    return y + x;
   }
 
   public static double subtract(double x, double y) {
@@ -10,7 +10,7 @@ public static double subtract(double x, double y) {
   }
 
   public static double multiply(double x, double y) {
-    return x * y;
+    return y * x;
   }
 
   public static double divide(double x, double y) {