diff --git a/calculator/calculator.go b/calculator/calculator.go
index 55fe9df..067f273 100755
--- a/calculator/calculator.go
+++ b/calculator/calculator.go
@@ -6,5 +6,9 @@ func Add(a, b float64) float64 {
 }
 
 func Subtract(a, b float64) float64 {
-	return b - a
+	return a - b
+}
+
+func Multiply(a, b float64) float64 {
+	return a * b
 }
diff --git a/calculator/calculator_test.go b/calculator/calculator_test.go
index 20c6f88..0ff3a09 100755
--- a/calculator/calculator_test.go
+++ b/calculator/calculator_test.go
@@ -22,3 +22,12 @@ func TestSubtract(t *testing.T) {
 		t.Errorf("want %f, got %f", want, got)
 	}
 }
+
+func TestMultiply(t *testing.T) {
+	t.Parallel()
+	var want float64 = 6
+	got := calculator.Multiply(2, 3)
+	if want != got {
+		t.Errorf("want %f, got %f", want, got)
+	}
+}