This document lists ordinal numbers from 1st to 100th in words and provides examples of how ordinal numbers are used for dates and fractions. Ordinal numbers are used to indicate the position in a list, like 20th September 2012 for the date. For most fractions, the ordinal number is used in words, such as 1/2 is referred to as a half and 1/3 as a third.

1. ORDINAL
NUMBERS

2. 1st FIRST

3. 2nd SECOND

4. 3rd THIRD

5. 4th FOURTH
5th FIFTH
6th SIXTH
7th SEVENTH
8th EIGHTH
9th NINTH
10th TENTH

6. 11th ELEVENTH
12th TWELFTH
13th THIRTEENTH
14th FOURTEENTH
15th FIFTEENTH
16th SIXTEENTH
17th SEVENTEENTH
18th EIGHTEENTH
19th NINETEENTH

7. 20th TWENTIETH
21st TWENTY-FIRST
22nd TWENTY-SECOND
23rd TWENTY-THIRD
24th TWENTY-FOURTH
(…)

8. 30th THIRTIETH
40th FORTIETH
50th FIFTIETH
60th SIXTIETH
70th SEVENTIETH
80th EIGHTIETH
90th NINETIETH

9. 100th ONE HUNDREDTH
1000th ONE THOUSANDTH
(…)

10. We use ordinal numbers:

11. FOR DATES:
20th September 2012
(the twentieth of September
twenty-twelve)

12. FOR MOST FRACTIONS:
½ A HALF
1/3 A THIRD
¼ A QUARTER
1/5 A FIFTH

13. FOR MOST FRACTIONS:
1/10 A TENTH
1/100 A HUNDREDTH
3/1000 THREE THOUSANDTHS
1/5 A FIFTH