diff --git a/calculator.rb b/calculator.rb
new file mode 100644
index 0000000..4b51806
--- /dev/null
+++ b/calculator.rb
@@ -0,0 +1,68 @@
+# Calculator Program
+
+# Methods
+def add(num_one, num_two)
+  return num_one + num_two
+end
+
+def subtract(num_one, num_two)
+  return num_one - num_two
+end
+
+def multiply(num_one, num_two)
+  return num_one * num_two
+end
+
+def divide(num_one, num_two)
+  return ((num_one.to_f) / (num_two.to_f)).round(2)
+end
+
+def valid_operator (operator)
+  until ["Add","+", "Subtract","-", "Multiply", "*", "Divide", "/"].include? (operator)
+    puts "Enter a valid selection"
+    operator = gets.chomp.downcase
+  end
+  return operator
+end
+
+def validate_number (num)
+  until num == num
+    puts "Enter a valid number"
+    num = gets.chomp.to_i
+  end
+  return num
+end
+
+puts "Welcome to the Le Calcuator Program! Enter the operator would you like to use?"
+puts "-----"
+operator_array = ["Add(+)", "Subtract(-)", "Multiply(*)", "Divide(/)"]
+puts operator_array
+user_operator = gets.chomp.downcase
+user_operator = valid_operator(user_operator)
+
+puts "Enter your first number."
+num_one = gets.chomp.to_i
+num_one = validate_number(num_one) #validatenumber calls the method, passes the argument num_one, and reassigns variable to the returned value of the method
+
+puts "Enter your second number."
+num_two = gets.chomp.to_i
+num_two = validate_number(num_two)
+
+# Equating the word "add" to the operator +, etc and incorporating methods
+case user_operator
+  when "add", "+"     
+    puts "We're adding numbers"
+    answer = add(num_one, num_two)
+    puts "Your answer is #{answer}."
+  when "subtract", "-"
+    answer = subtract(num_one, num_two)
+    puts "Your answer is #{answer}."
+  when "multiply", "*"
+    answer = multiply(num_one, num_two)
+    puts "Your answer is #{answer}."
+  when "divide", "/"
+    answer = divide(num_one, num_two)
+    puts "Your answer is #{answer}."
+  else
+    puts "What do you want from me?!"
+end
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