前為基數詞,後為序數詞

1:one first

2:two second

3:three third

4:four fourth

5:five fifth

6:six sixth

7:seven seventh

8:eight eighth

9:nine ninth

10:ten tenth

11:eleven eleventh

12:twelve twelfth

13:thirteen thirteenth

14:fourteen fourteenth

15:fifteen fifteenth

16:sixteen sixteenth

17:seventeen seventeenth

18:eighteen eigteenth

19:nineteen nineteenth

20:twenty twentieth

21:twenty-one twenty-first

22:twenty-two twenty-second

23:twenty-three twenty-third

24:twenty-four twenty-fourth

25:twenty-five twenty-fifth

26:twenty-six twenty-sixth

27:twenty-seven twenty-seventh

28:twenty-eight twenty-eighth

29:twenty-nine twenty-ninth

30:thirty thirtieth

31thirty-one thirty-first