diff --git a/math.py b/math.py
index 32963f4..bfc5267 100644
--- a/math.py
+++ b/math.py
@@ -1,3 +1,5 @@
 def addition(a: float, b: float) -> str:
     return a + b
 
+def subtraction(a: float, b: float) -> float:
+    return a - b