Done

lib/math.rb

@@ -1,23 +1,31 @@
 def addition(num1, num2)
-
+  sum = num1 + num2
+  return sum
 end
 
 def subtraction(num1, num2)
-
+  difference = num1 - num2
+  return difference 
 end
 
 def division(num1, num2)
-
+  quotient = num1 / num2
+  return quotient
 end
 
 def multiplication(num1, num2)
-
+  product = num1 * num2
+  return product 
 end
 
 def modulo(num1, num2)
-
+  divide = num1 / num2 
+  round = num2 * divide
+  remainder = num1 - round
+  return remainder
 end
 
 def square_root(num)
-
+  root = Math.sqrt(num)
+  return root
 end