diff --git a/numberwords.py b/numberwords.py
index 8c590cd..31ea5ce 100644
--- a/numberwords.py
+++ b/numberwords.py
@@ -4,31 +4,56 @@
 # Functions to print out a verbal representation of an integer.
 
 MAXIMUM = 1000000
-DIGIT_NAMES = [
-    "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
-]
-TWEEN_AND_TEEN_NAMES = [
-    "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"
-]
-TENS_NAMES = [
-    "", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"
-]
+DIGIT_NAMES = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
+TWEEN_AND_TEEN_NAMES = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
+TENS_NAMES = ["", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]   
+
+def check_number_in_range(number, minimum, maximum):
+    if minimum < number & number < maximum:
+        return True
+    else:
+        return False
 
 def int_under_1000000_to_str(number):
-    return "umm..."
+    thousands, hundreds = divide_with_remainder(number, 1000)
+    if number < 1000:
+        return int_under_1000_to_str(number)
+    elif number % 1000 == 0: 
+        return int_under_1000_to_str(thousands) + " thousand"
+    else:
+        name =  int_under_1000_to_str(thousands) + " thousand, " + int_under_1000_to_str(hundreds)
+        return name
         
 def int_under_1000_to_str(number):
-    return "umm..."
+    hundreds, tens = divide_with_remainder(number, 100)
+    if number < 100:
+        return int_under_100_to_str(number)
+    elif number % 100 == 0:
+        return DIGIT_NAMES[hundreds] + " hundred"
+    else:
+        return DIGIT_NAMES[hundreds] + " hundred and " + int_under_100_to_str(tens)
+        
+
 
 def int_under_100_to_str(number):
-    return "umm..."
+    tens, ones = divide_with_remainder(number, 10)
+    if number < 20:
+        return int_under_20_to_str(number)
+    elif number % 10 != 0:
+        return TENS_NAMES[tens] + "-" + DIGIT_NAMES[ones]
+    else: 
+        return TENS_NAMES[tens]
 
 def int_under_20_to_str(number):
-    return "umm..."
+    tens, ones = divide_with_remainder(number, 10)
+    if number < 10:
+        return int_under_10_to_str(number)
+    else:
+        return TWEEN_AND_TEEN_NAMES[ones]
 
 def int_under_10_to_str(number):
-    return "umm..."
-
+    return DIGIT_NAMES[number]
+   
 def divide_with_remainder(dividend, divisor):
     """Divides one number by another, using whole-number division. 
     Returns the quotient and the remainder. 
diff --git a/planning.md b/planning.md
index 40d428a..6ddc16a 100644
--- a/planning.md
+++ b/planning.md
@@ -36,20 +36,41 @@ return digit_names[number]
 
 ## Integers under 20
 If the integer is under 10, then use the procedure described above. 
-Otherwise, ... (this is where you take over!)
+Otherwise, you still need to know the name of the integer since it has a unique name. Create a list of integers called teens_names and index from 0 to 9. Then you can look up the integer's name. 
 
+The list would be:
+```
+teens_names = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
+
+return teens_names[number]
+```
 ## Integers under 100
+If the integer is less than 20, then use either of the procedures described above. 
 
+Otherwise: 
+- Look at the first digit to know what "tens" name it's called. 
+- Then, if the second digit is not 0, access the digit_names list to create the secont part of the word. 
 
 ## Integers under 1000
+If the integer is less than 100, then use one of the procedures above. 
 
+Otherwise: 
+- Look at the first digit and use the digit_names list for the first part of the word
+- Add the word "hundred" 
+- Use the procedures for integers under 100 to come up with the rest of the word. 
 
 ## Integers under 1000000
+If the integer is less than 1000, use one of the procedures above. 
 
+Otherwise: 
+- Look at the first three digits. Use the procedure for integers under 1000 for the first part of the name. 
+- Add the word thousand
+- use the procedure for integers under 1000 to create the last part of the name. 
 
 ## Negative integers down to -1 million
 We won't deal with negative integers in this problem set, 
 but how would you deal with a negative integer, using the 
 functions above?
 
+- Use the procedures above, but concatenate them to the word "negative"