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The output I'm getting for my little example app is the following: Welcome to the Calculator! Please choose what you'd like to do: 0: Addition 1: Subtraction 2: Multiplication 3: Division 4: Quit Application 0 Enter your first number: 1 Enter your second number: 1 Your result is: 11 This is because the addition() method is taking the input() as strings and not numbers. How can I use them as numbers? Here is my entire script: def addition(a, b): return a + b def subtraction(a, b): return a - b def multiplication(a, b): return a * b def division(a, b): return a / b keepProgramRunning = True print "Welcome to the Calculator!" while keepProgramRunning: print "Please choose what you'd like to do:" print "0: Addition" print "1: Subtraction" print "2: Multiplication" print "3: Division" print "4: Quit Application" #Capture the menu choice. choice = raw_input() if choice == "0": numberA = raw_input("Enter your first number: ") numberB = raw_input("Enter your second number: ") print "Your result is:" print addition(numberA, numberB) elif choice == "1": numberA = raw_input("Enter your first number: ") numberB = raw_input("Enter your second number: ") print "Your result is:" print subtraction(numberA, numberB) elif choice == "2": numberA = raw_input("Enter your first number: ") numberB = raw_input("Enter your second number: ") print "Your result is:" print multiplication(numberA, numberB) elif choice == "3": numberA = raw_input("Enter your first number: ") numberB = raw_input("Enter your second number: ") print "Your result is:" print division(numberA, numberB) elif choice == "4": print "Bye!" keepProgramRunning = False else: print "Please choose a valid option." print "

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