diff --git a/first/Program.cs b/first/Program.cs
index 08cb789..084414e 100644
--- a/first/Program.cs
+++ b/first/Program.cs
@@ -9,6 +9,12 @@
 
             Console.WriteLine(a.First);
             Console.WriteLine(a.Second);
+
+            a.Multiply(2);
+
+            Console.WriteLine(a.First);
+            Console.WriteLine(a.Second);
+            Console.WriteLine(a.Value);
         }
     }
 }
diff --git a/first/SplitNumber.cs b/first/SplitNumber.cs
index 044ff17..b31fd5b 100644
--- a/first/SplitNumber.cs
+++ b/first/SplitNumber.cs
@@ -29,5 +29,12 @@ namespace first
                 Second = value - First;
             }
         }
+
+        public double Multiply(double mul)
+        {
+            Value = Value * mul;
+
+            return Value;
+        }
     }
 }