diff --git a/exercises/10-Two_digits/app.py b/exercises/10-Two_digits/app.py
index d6b6011e..bb47dde0 100644
--- a/exercises/10-Two_digits/app.py
+++ b/exercises/10-Two_digits/app.py
@@ -5,4 +5,4 @@ def two_digits(digit):
 
 
 #Invoke the function with any interger as its argument.
-print(two_digits())
+print(two_digits(79))
diff --git a/exercises/11-Swap_digits/README.es.md b/exercises/11-Swap_digits/README.es.md
index 3da4d630..e20becb6 100644
--- a/exercises/11-Swap_digits/README.es.md
+++ b/exercises/11-Swap_digits/README.es.md
@@ -2,20 +2,26 @@
 
 ## 📝 Instrucciones:
 
-1. Dado un entero de dos dígitos, intercambia sus dígitos de posición e imprime el resultado.
+1. Crea una función llamada `swap_digits()` dado un número entero de dos dígitos, intercambia sus dígitos de posición e imprime el resultado.
 
-### Ejemplo de entrada:
+## Ejemplo de entrada:
 
-+ 79
+```
+swap_digits(79)
+```
 
-### Ejemplo de salida:
+## Ejemplo de salida:
 
-+ 97
+```
+97
+```
 
 ## 💡 Pista:
 
-+ Si no sabes cómo empezar la solución a esta asignación, por favor, revisa la teoría en esta lección:
-https://snakify.org/lessons/integer_float_numbers/
++ Si no sabes cómo empezar la solución a esta asignación, por favor, revisa la teoría en esta lección: https://snakify.org/lessons/integer_float_numbers/
 
-+ También puedes intentar paso a paso con trozos de la teoría:
-https://snakify.org/lessons/integer_float_numbers/steps/1/
\ No newline at end of file
++ También puedes intentar paso a paso con parte de la teoría: https://snakify.org/lessons/integer_float_numbers/steps/1/
+
++ Ten en cuenta que para concatenar dos números puedes transformar su valor en un string con str(num).
+
++ El valor a retornar debe ser un número entero.
diff --git a/exercises/11-Swap_digits/README.md b/exercises/11-Swap_digits/README.md
index db5e824d..e63c9a90 100644
--- a/exercises/11-Swap_digits/README.md
+++ b/exercises/11-Swap_digits/README.md
@@ -2,20 +2,26 @@
 
 ## 📝 Instructions:
 
-1. Given a two-digit integer, swap its digits and print the result.
+1. Create a function named `swap_digits()` given a two-digit integer, swap its digits and print the result.
 
-### Example input:
+## Example input:
 
-+ 79
+```py
+swap_digits(79)
+```
 
-### Example output:
+## Example output:
 
-+ 97
+```
+97
+```
 
 ## 💡 Hint:
 
-+ If you don't know how to start solving this assignment, please, review a theory for this lesson:
-https://snakify.org/lessons/integer_float_numbers/
++ If you don't know how to start solving this assignment, please, review a theory for this lesson: https://snakify.org/lessons/integer_float_numbers/
 
-+ You may also try step-by-step theory chunks:
-https://snakify.org/lessons/integer_float_numbers/steps/1/
\ No newline at end of file
++ You can also try step-by-step with theory chunks: https://snakify.org/lessons/integer_float_numbers/steps/1/
+
++ Note that you need to concatenate two numbers, so you may have to convert them into a string `str(number)`.
+
++ The function must return a number.
diff --git a/exercises/11-Swap_digits/app.py b/exercises/11-Swap_digits/app.py
index 697823fb..d60c443c 100644
--- a/exercises/11-Swap_digits/app.py
+++ b/exercises/11-Swap_digits/app.py
@@ -1,9 +1,7 @@
 #Complete the fuction to return the swapped digits of a given two-digit-interger.
 def swap_digits(num):
-  return None
-   
-   
+  # Your code here
+  
    
 #Invoke the function with any two digit interger as its argument
-print(swap_digits())
-
+print(swap_digits(30))
diff --git a/exercises/11-Swap_digits/test.py b/exercises/11-Swap_digits/test.py
index a0054654..9c9f61ab 100644
--- a/exercises/11-Swap_digits/test.py
+++ b/exercises/11-Swap_digits/test.py
@@ -1,12 +1,21 @@
-import io, sys, pytest, os, re, mock
+import io, sys, pytest, os, re, mock, app
 
 @pytest.mark.it('The function swap_digits must exist')
-def test_for_functon_existence(capsys, app):
-    assert callable(app.swap_digits)
-
-@pytest.mark.it('The function swap_digits must swap the digits of a 2 digits integer')
-def test_for_file_output(capsys, app):
-    assert app.swap_digits(30) == str(30%10)+str(30//10)
+def test_function_exists():
+    assert app.swap_digits
 
+@pytest.mark.it('The function swap_digits must return something')
+def test_return_exists():
+    assert app.swap_digits(12) != None
 
+@pytest.mark.it('The function swap_digits should return an integer')
+def test_return_integer():
+    assert type(app.swap_digits(23)) == type(1)
+    
+@pytest.mark.it('The function `swap_digits` must swap the digits. Testing with 79')
+def test_for_file_output(capsys, app):
+    assert app.swap_digits(79) == 97
 
+@pytest.mark.it('The function `swap_digits` must swap the digits. Testing with 30')
+def test_for_file_output_2(capsys, app):
+    assert app.swap_digits(30) == 3