How do you spell out numbers with th?

The letters th are added to cardinal numbers to make them ordinal, or to form fractional parts, and in some cases changes the spelling :

four --> fourth

fourteen --> fourteenth

five --> fifth

fifteen --> fifteenth

Ordinals ending in 1 use st instead (1st), ending in 2 use nd (2nd), ending in 3 use rd (3rd):

one --> first

thirty-one --> thirty-first

two --> second

forty-two --> forty-second

three --> third

sixty-three --> sixty-third

*The number forms cannot be used to represent fractions (e.g. 4th, 6th, 8th).

1/4 = one-fourth, 3/5 = three-fifths, 7/8 = seven-eighths, 12/19 = twelve-nineteenths

2nd - second

3rd - third

4th - fourth

5th - fifth

6th - sixth

7th - seventh

8th - eighth

9th - ninth

10th - tenth

11th - eleventh

12th - twelfth

13th - thirteenth

14th - fourteenth

15th - fifteenth

16th - sixteenth

17th - seventeenth

18th - eighteenth

19th - nineteenth

20th - twentieth

21st - twenty-first

25th - twenty-fifth

30th - thirtieth

35th - thirty-fifth

40th - fortieth

50th - fiftieth

60th - sixtieth

70th - seventieth

80th - eightieth

90th - ninetieth

100th - hundredth

1000th - thousandth

1000000th - millionth