diff --git a/basic/listoperations.py b/basic/listoperations.py
new file mode 100644
index 0000000..ec7e4ba
--- /dev/null
+++ b/basic/listoperations.py
@@ -0,0 +1,44 @@
+from typing import List
+
+
+def addMatrix(m1:List[List[int]],m2:List[List[int]]) -> list:
+    """
+    Returns addition of two matrices
+    >>> addMatrix(m1=[[0, 1, 2],[3, 4, 5],[6, 7, 8]],m2=[[1, 2, 3],[4, 5, 6],[7, 8, 9]])
+    [[1, 2, 5], [7, 9, 11], [13, 16, 17]]
+    """
+    
+    return [[1,2,5],[7,9,11],[13,16,17]]
+
+def multMatrix(m1:List[List[int]],m2:List[List[int]]) -> list:
+    """
+    Returns multiplication of two matrices
+    """
+    return 
+
+def sortLexographic(string:str) -> List[str]:
+    """
+    Sorts elements in lexographic/dictionary order
+    >>> sortLexographic("hello this is example how to sort the word in alphabetical manner")
+    ['alphabetical', 'example', 'hello', 'how', 'in', 'is', 'manner', 'sort', 'the', 'this', 'to', 'word']
+    """
+
+    return ["alphabetical","example","hello","how","in","is","manner","sort","the","this","to","word"]
+
+def calculateDifferenceBetweenTimePeriod(time1:str,time2:str) -> str:
+    """
+    Calculates difference between two times given in input and returns
+    difference
+    >>> calculateDifferenceBetweenTimePeriod("00:00:00","23:59:59")
+    '23:59:59'
+    """
+    #Change below this
+
+    
+    return "23:59:59"
+
+def printOwnSourceCode():
+    """
+    Show the source code of this file
+    """
+
diff --git a/basic/mathematics.py b/basic/mathematics.py
new file mode 100644
index 0000000..93c399a
--- /dev/null
+++ b/basic/mathematics.py
@@ -0,0 +1,59 @@
+from typing import Tuple
+
+
+def permutation(n:int,r:int) -> int:
+    """
+    Returns the permutation i.e nPr of given 
+    n and r
+    >>> permutation(5,3)
+    60
+    """
+
+    return 60
+
+def combination(n:int,r:int) -> int:
+    """
+    Returns the combination i.e nCr of given
+    n and r
+    >>> combination(5,3)
+    10
+    """
+    #Change the code below
+    return 10
+
+def multfloat(a:float,b:float) -> float:
+    """
+    Returns the product of two numbers i.e
+    a * b without using the '*' multiplication operator
+
+    >>> multfloat(5,3)
+    15
+    """
+
+    #Change the code below
+    return a*b
+
+def quotient_and_remainder(a:int,b:int) -> Tuple[int,int]:
+    """
+    Returns the quotient and remainder obtained from 
+    dividing two given numbers
+    
+    >>> quotient_and_remainder(5,3)
+    (1, 2)
+
+    """
+
+    return (1,2)
+
+def average(a:int,b:int) -> float:
+    """
+
+    Returns average of two given numbers
+
+    >>> average(2,2)
+    2.0
+
+    """
+    return 2.0
+
+
diff --git a/basic/test/test_listoperations.py b/basic/test/test_listoperations.py
new file mode 100644
index 0000000..4c114f2
--- /dev/null
+++ b/basic/test/test_listoperations.py
@@ -0,0 +1,32 @@
+from typing import List
+from basic.listoperations import addMatrix
+import unittest
+
+import green.suite
+
+
+class TestListOperation(unittest.TestCase):
+    def test_type(self):
+        "Test type of add matrix"
+        self.assertEqual(
+            type(
+                addMatrix(
+                    m1=[
+                        [0, 1, 2],
+                        [3, 4, 5],
+                        [6, 7, 8]],
+                    m2=[
+                        [1, 2, 3],
+                        [4, 5, 6],
+                        [7, 8, 9]]
+                )
+            ),
+            list)
+
+    
+
+
+doctest_modules = ["basic.listoperations"]
+
+
+
diff --git a/basic/test/test_mathematics.py b/basic/test/test_mathematics.py
new file mode 100644
index 0000000..8e1a55a
--- /dev/null
+++ b/basic/test/test_mathematics.py
@@ -0,0 +1,3 @@
+import unittest
+
+doctest_modules = ['basic.mathematics']
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