diff --git a/source/Data_Types.rst b/source/Data_Types.rst
index 23cdd154c74c58f65402ea5b3f587f30a4442b68..a9f8eca3e11a395c27820ce2e653557ceaf5411d 100644
--- a/source/Data_Types.rst
+++ b/source/Data_Types.rst
@@ -1,6 +1,3 @@
-.. sectnum:: 
-   :start: 3
-
 .. _Data_Types:
 
 **********
diff --git a/source/Input_output.rst b/source/Input_output.rst
index df6101527247adc5f2a16ace735230e09590daa0..dbf872a45925250f456b871382cb188d05d9a38e 100644
--- a/source/Input_output.rst
+++ b/source/Input_output.rst
@@ -1,8 +1,8 @@
-.. _Variables:
+.. _Input_Output:
 
-************************************
-Variables, Expression and statements
-************************************
+****************
+Input and Output
+****************
 
 Exercises
 =========
diff --git a/source/Variables.rst b/source/Variables.rst
index d4037b7019f545bc8af484766b7ca455a729684d..ec525c26347ce7322ca65819fb5fb09c1798d495 100644
--- a/source/Variables.rst
+++ b/source/Variables.rst
@@ -1,6 +1,3 @@
-.. sectnum:: 
-   :start: 2
-
 .. _Variables:
 
 ************************************