diff --git a/calculator.rb b/calculator.rb
new file mode 100644
index 0000000..0cc50d1
--- /dev/null
+++ b/calculator.rb
@@ -0,0 +1,57 @@
+# Welcome message for user
+puts "Welcome to the Ada Calculator!"
+puts "These are the following choices:"
+puts "1. add(+)"
+puts "2. subtract(-)"
+puts "3. multiply(*)"
+puts "4. divide(/)"
+puts "Please choose an operand:"
+
+# Accepting user choice (case insensitive)
+operand = gets.chomp.downcase
+
+# Ensuring user is choosing a valid operation
+until ["add", "+", "subtract", "-", "multiply", "*", "divide", "/"].include? (operand) do
+  puts "Please enter a valid operand"
+  operand = gets.chomp.downcase
+end
+
+# Asking user to input values to be used in calculations
+puts "Please enter the first value: "
+first_value = gets.chomp.to_f
+
+# Insert logic to ensure first_value entered is a number
+
+puts "Please enter the second value: "
+second_value = gets.chomp.to_f
+
+# Insert logic to ensure second_value entered is a number
+
+# Defining methods for each operand
+def addittion(x, y)
+  return (x + y)
+end
+
+def subtraction(x, y)
+  return (x - y).to_f
+end
+
+def multiplication(x, y)
+  return (x * y).to_f
+end
+
+def division (x , y)
+  # Insert conditional: If y == 0, then print message "Cannot divide by zero" and enter a while loop that states while y == 0, keep asking user to input a valid value. When y != 0, return (x / y). Else, return (x / y)
+  return (x / y).to_f
+end
+
+# Determining which method to invoke depending on the operand chosen by the user
+if operand == "add" || operand == "+"
+  puts "Answer: #{first_value} + #{second_value} = #{addittion(first_value, second_value)}"
+elsif operand == "subtract" || operand == "-"
+  puts "Answer: #{first_value} - #{second_value} = #{subtraction(first_value, second_value)}"
+elsif operand == "multiply" || operand == "*"
+  puts "Answer: #{first_value} * #{second_value} = #{multiplication(first_value, second_value)}"
+elsif operand == "divide" || operand == "/"
+  puts "Answer: #{first_value} / #{second_value} = #{division(first_value, second_value)}"
+end