diff --git a/students/dychowicz_monika/lesson_11_argparse_and_math/README.md b/students/dychowicz_monika/lesson_11_argparse_and_math/README.md
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+++ b/students/dychowicz_monika/lesson_11_argparse_and_math/README.md
@@ -0,0 +1,11 @@
+### Lesson 11 - argparse  + math
+#### introduction
+- [What is argparse?](http://www.bogotobogo.com/python/python_argparse.php)
+- [argparse — Command-Line Option and Argument Parsing](https://pymotw.com/3/argparse/)
+#### practice projects
+1. Modify project 1 from lesson 9 to use argparse for parsing input
+1. Modify project 2 from lesson 9 to use argparse for parsing input
+1. Modify project 3 from lesson 9 to use argparse for parsing input
+1. Modify project 1 from lesson 10 to use argparse for parsing input
+1. Modify project 2 from lesson 10 to use argparse for parsing input
+1. Modify project 3 from lesson 10 to use argparse for parsing input
diff --git a/students/dychowicz_monika/lesson_11_argparse_and_math/filling_the_gaps_argparse.py b/students/dychowicz_monika/lesson_11_argparse_and_math/filling_the_gaps_argparse.py
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+++ b/students/dychowicz_monika/lesson_11_argparse_and_math/filling_the_gaps_argparse.py
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+import os
+import re
+import argparse
+
+
+def check_args(args=None):
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-p", "--prefix",
+                        help="prefix",
+                        default="spam")
+    parser.add_argument("-d", "--directory",
+                        help="directory",
+                        default=r"C:\Python36\gaps")
+    results = parser.parse_args(args)
+    return results.prefix, results.directory
+
+
+def fill_the_gaps(folder):
+    for foldername, subfolders, filenames in os.walk(folder):
+        filenames = sorted(filenames)
+        index = 1
+        new_filename = ""
+        for filename in filenames:
+            if pattern.match(filename):
+                if index == 1:
+                    new_filename = filename
+                print(filename, new_filename, index)
+                if filename != new_filename:
+                    print(
+                        "Lack of filename: " + new_filename + "\nFile " +
+                        filename + " will be renamed.")
+                    filename_path = os.path.join(foldername, filename)
+                    new_filename_path = os.path.join(foldername, new_filename)
+                    os.rename(filename_path, new_filename_path)
+                new_filename = filename.replace(str(index), str(index + 1))
+                index += 1
+
+
+if __name__ == '__main__':
+    prefix, directory = check_args()
+    pattern = re.compile(prefix + r'.*(\d{3})')
+    fill_the_gaps(directory)
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diff --git a/students/dychowicz_monika/lesson_11_argparse_and_math/regex_search_argparse.py b/students/dychowicz_monika/lesson_11_argparse_and_math/regex_search_argparse.py
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+++ b/students/dychowicz_monika/lesson_11_argparse_and_math/regex_search_argparse.py
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+import os
+import re
+import argparse
+
+
+def check_args(args=None):
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-r", "--regex",
+                        help="regex",
+                        default=".*")
+    parser.add_argument("-d", "--directory",
+                        help="directory",
+                        default=r"C:\Python36\files")
+    results = parser.parse_args(args)
+    return results.regex, results.directory
+
+
+def regex_search(reg, folder):
+    regex_text = re.compile(reg)
+    files_list = os.listdir(folder)
+    for file in files_list:
+        if file.endswith('.txt'):
+            with open(os.path.join(folder, file)) as textfile:
+                for line in textfile:
+                    if regex_text.match(line):
+                        print("Regex found " + line)
+
+
+if __name__ == '__main__':
+    regex, directory = check_args()
+    regex_search(regex, directory)
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diff --git a/students/dychowicz_monika/lesson_11_argparse_and_math/selective_copy_argparse.py b/students/dychowicz_monika/lesson_11_argparse_and_math/selective_copy_argparse.py
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+++ b/students/dychowicz_monika/lesson_11_argparse_and_math/selective_copy_argparse.py
@@ -0,0 +1,31 @@
+import os
+import shutil
+import argparse
+
+
+def check_args(args=None):
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-s", "--source",
+                        help="source directory",
+                        default=r'C:\python_to_copy')
+    parser.add_argument("-d", "--destination",
+                        help="destination directory",
+                        default=r'C:\python_copied')
+    parser.add_argument("-e", "--extension",
+                        help="extension",
+                        default=".txt")
+    results = parser.parse_args(args)
+    return results.source, results.destination, results.extension
+
+
+def selective_copy(source_folder, destination_folder, ext):
+    for foldername, subfolders, filenames in os.walk(source_folder):
+        for filename in filenames:
+            if filename.lower().endswith(ext):
+                shutil.copy(os.path.join(source_folder, filename),
+                            destination_folder)
+
+
+if __name__ == '__main__':
+    source, destination, extension = check_args()
+    selective_copy(source, destination, extension)
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