Ugly ugly version of all integers up to 1000 in words

Nums in Words

module InWords
      def in_words
      num_array = self.to_s.split('')

      ones_place = {"0" => "", "1" => "one", "2" => "two", "3" => "three", "4" => "four", "5" => "five", "6" => "six",
       "7" => "seven", "8" => "eight", "9" => "nine"}
      final_digit_in_words = ones_place[num_array[-1]]

      tens_place = {"0" => "", "1" => "", "2" => "twenty", "3" => "thirty", "4" => "forty", "5" => "fifty", "6" => "sixty", "7" => "seventy", "8" => "eighty",
         "9" => "ninety"}
      second_to_last_digit_in_words = tens_place[num_array[-2]]

      hundreds_place = {"1" => "one hundred", "2" => "two hundred", "3" => "three hundred", "4" => "four hundred", "5" => "five hundred", "6" => "six hundred",
       "7" => "seven hundred", "8" => "eight hundred", "9" => "nine hundred"}
      third_to_last_digit_in_words = hundreds_place[num_array[-3]]

      teens_array = {"10" => "ten", "11" => "eleven", "12" => "twelve", "13" => "thirteen", "14" => "fourteen",
        "15" => "fifteen", "16" => "sixteen", "17" => "seventeen", "18" => "eighteen", "19" => "nineteen"}



      if num_array.length == 4
        return "one thousand"
      elsif num_array[0] == "1" && num_array.length == 2
          return teens_array[num_array.join]
       elsif num_array[1] == "1" && num_array.length == 3
         last_two = num_array[1..2]
          return third_to_last_digit_in_words.to_s + " " + teens_array[last_two.join].to_s
       elsif num_array[1] == "0" && num_array.length == 3
         return third_to_last_digit_in_words + " " + final_digit_in_words
       elsif num_array.length == 2
         return "#{second_to_last_digit_in_words} #{final_digit_in_words}"
      elsif num_array.length == 1
        return final_digit_in_words
      else
        return "#{third_to_last_digit_in_words} #{second_to_last_digit_in_words} #{final_digit_in_words}"
      end
    end

end

class Fixnum
    include InWords
end