diff --git a/lib/math.rb b/lib/math.rb
index 011b88ff..d3b2af07 100644
--- a/lib/math.rb
+++ b/lib/math.rb
@@ -1,23 +1,23 @@
 def addition(num1, num2)
-
+  num1 + num2
 end
 
 def subtraction(num1, num2)
-
-end
+  num1 - num2 
+end 
 
 def division(num1, num2)
-
+  num1 / num2
 end
 
 def multiplication(num1, num2)
-
+  num1 * num2
 end
 
 def modulo(num1, num2)
-
+  num1 % num2
 end
 
 def square_root(num)
-
+  Math.sqrt(num)
 end
\ No newline at end of file