ORDINAL NUMBERS

1st FIRST

2nd SECOND

3rd THIRD

4th FOURTH5th FIFTH6th SIXTH

7th SEVENTH8th EIGHTH9th NINTH

10th TENTH

11th ELEVENTH12th TWELFTH

13th THIRTEENTH14th FOURTEENTH

15th FIFTEENTH16th SIXTEENTH

17th SEVENTEENTH18th EIGHTEENTH19th NINETEENTH

20th TWENTIETH21st TWENTY-FIRST

22nd TWENTY-SECOND23rd TWENTY-THIRD

24th TWENTY-FOURTH(…)

30th THIRTIETH40th FORTIETH50th FIFTIETH60th SIXTIETH

70th SEVENTIETH80th EIGHTIETH90th NINETIETH

100th ONE HUNDREDTH1000th ONE THOUSANDTH

(…)

We use ordinal numbers:

FOR DATES:20th September 2012

(the twentieth of September twenty-twelve)

FOR MOST FRACTIONS:

½ A HALF1/3 A THIRD

¼ A QUARTER1/5 A FIFTH

FOR MOST FRACTIONS:

1/10 A TENTH1/100 A HUNDREDTH

3/1000 THREE THOUSANDTHS1/5 A FIFTH