Ordinal numbers

Image  He's in first place. 

 

Ordinal numbers indicate order, sequence or position.

 



1st

first

20th

twentieth

2nd

second

21st

twenty-first

3rd

third

22nd

twenty-second

4th

fourth

23rd

twenty-third

5th

fifth

24th

twenty-fourth

6th

sixth

25th

twenty-fifth

7th

seventh

26th

twenty-sixth

8th

eighth

27th

twenty-seventh

9th

ninth

28th

twenty-eighth

10th

tenth

29th

twenty-ninth

11th

eleventh

30th

thirtieth

12th

twelfth

 

 

13th

thirteenth

40th

fortieth

14th

fourteenth

50th

fiftieth

15th

fifteenth

60th

sixtieth

16th

sixteenth

70th

seventieth

17th

seventeenth

80th

eightieth

18th

eighteenth

90th

ninetieth

19th

nineteenth

100th

(one) hundredth


Note that
we usually write smaller numbers in words (tenth) and bigger numbers in figures (40th), although there is no strict rule for this.


There are a lot of uses, for example, to talk about dates and anniversaries and to give directions.
 

 

Image  It's his 35th birthday.

Image        And in the second half of last year...
Image  Your room is on the fourth floor.

Image  Hello, nice to meet you. Is this your first visit to the UK?

Image                He's nervous because it is their first date.

Image      They're celebrating their 50th anniversary.