diff --git a/src/math_operations.py b/src/math_operations.py
index ae02251..084d51c 100644
--- a/src/math_operations.py
+++ b/src/math_operations.py
@@ -2,4 +2,7 @@ def add(a,b):
     return a+b
 
 def sub(a,b):
-    return a-b 
\ No newline at end of file
+    return a-b 
+
+def mul(a, b):
+    return a * b
\ No newline at end of file
diff --git a/tests/test_operation.py b/tests/test_operation.py
index 07e3ec7..9e66d9c 100644
--- a/tests/test_operation.py
+++ b/tests/test_operation.py
@@ -1,4 +1,4 @@
-from src.math_operations import add,sub
+from src.math_operations import add,sub,mul
 
 def test_add():
     assert add(2,3)==5
@@ -8,4 +8,10 @@ def test_sub():
     assert sub(5,3)==2
     assert sub(4,3)==1
     assert sub(3,3)==0
-    assert sub(2,3)==-1
\ No newline at end of file
+    assert sub(2,3)==-1
+
+def test_mul():
+    assert mul(1, 0) == 0 
+    assert mul(0, 1) == 0 
+    assert mul(1, 1) == 1
+    assert mul(100, 100) == 10000 
\ No newline at end of file