diff --git a/calculator.rb b/calculator.rb
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+# Week#1: Calculator Build
+# Ana Lisa Sutherland - Octos C9
+
+# method for addition using two numbers
+def addition (num_one, num_two)
+  return num_one + num_two
+end
+#method for subtracting using two numbers
+def subtraction (num_one, num_two)
+  return num_one - num_two
+end
+#method for multiplication using two numbers
+def multiply (num_one, num_two)
+  return num_one * num_two
+end
+#method for division using two numbers
+def divide (num_one, num_two)
+  return num_one / num_two
+end
+#OPTIONAL: method for exponents
+def exponent (num_one, num_two)
+  return num_one ** num_two
+end
+#OPTIONAL: method for modulo
+def modulo (num_one, num_two)
+  return num_one % num_two
+end
+#OPTIONAL: ENSURE IT IS ONLY NUMBERS THAT ARE ENTERED
+def req ()
+  num = gets.chomp
+  until num =~ /^[1-9]\d*(\.\d+)?$/
+    if num =~ /^[1-9]\d*(\.\d+)?$/
+      return num
+    else
+      puts "Invalid number."
+      num = gets.chomp
+    end
+  end
+  if num =~ /\A\d+\z/
+    puts 'integer'
+    return num.to_i
+  elsif num =~ /\A\d+\.\d+\z/
+    puts 'float'
+    return num.to_f
+  else
+    puts 'not integer or float'
+  end
+end
+
+#collect first number from the user and run it through req method
+puts "Welcome, seems like you need a calculator.\n\Please Input a number."
+num_1 = req()
+puts "Enter a command."
+# make sure that only operators are accepted
+command_use = gets.chomp
+until ["add", "+", "subtract", "-","multiply", "*", "divide", "/", "**", "^", "modulo", "%"].include?(command_use)
+  puts "Please put a valid command!"
+  command_use = gets.chomp
+end
+
+#collect second number from the user and run it through req method
+puts "Enter a second number."
+num_2 = req()
+
+#method to utilize both written and modifying commands
+case command_use
+when "add", "+"
+  puts "We're adding numbers"
+  result = addition(num_1,num_2)
+when "subtract", "-"
+  puts "We're subtracting numbers"
+  result = subtraction(num_1,num_2)
+when "multiply", "*"
+  puts "We're multiplying numbers"
+  result = multiply(num_1,num_2)
+when "divide", "/"
+  puts "We're dividing numbers"
+  if num_2 != 0
+    result = divide(num_1,num_2)
+  else
+    puts "You cannot divide by 0."
+  end
+when "^", "**"
+  puts "We're exponentiating numbers"
+  result = exponent(num_1,num_2)
+when "modulo", "%"
+  puts "We are using a modulo for numbers."
+  results = modulo(num_1,num_2)
+else
+  puts "That makes no sense. Please tell me which operator you want to use."
+  command = gets.chomp
+end
+puts "#{num_1} #{command_use} #{num_2} = #{result}"