1st

(the) first

11th

(the) eleventh

2nd

(the) second

12th

(the) twelfth

3rd

(the) third 

13th

(the) thirteenth

4th

(the) fourth

14th

(the) fourteenth

5th

(the)fifth

15th

(the) fifteenth

6th

(the) sixth

16th

(the) sixteenth

7th

(the) seventh

20th

(the) twentieth

8th

(the) eighth

40th

(the) fortieth

9th

(the) ninth

50th

(the) fiftieth

10th

(the) tenth

70th

(the) sixtieth

21st

(the) twenty-first

80th

(the) eightieth

22nd

(the) twenty-second

90th

(the) ninetieth

23rd

(the) twenty-third

100th

(the) hundredth

24th

(the) twenty-fourth

1,000th

(the) thousandth

25th

(the) twenty-fifth

1,000,000th

(the) millionth

26th

(the) twenty-sixth

27th

(the) twenty-seventh

28th

(the) twenty-eighth

29th

(the) twenty-ninth

30th

(the) thirtieth