Ordinal numbers

Spelling of Ordinal Numbers
Just add -th to the cardinal number:

four - fourth
eleven - eleventh

Exceptions:

one - first	five - fifth	eight - eighth
two - second	nine - ninth
three - third	twelve - twelfth

In compound ordinal numbers, note that only the last figure is written as an ordinal number:

421st = four hundred and twenty-first
5,111th = five thousand, one hundred and eleventh

 

Figures

When expressed as figures, the last two letters of the written word are added to the ordinal number:

first = 1st	third = 3rd	twenty-sixth = 26th
second = 2nd	fourth = 4th	hundred and first = 101st

Titles

In names for kings and queens ordinal numbers are written in Roman numerals. In spoken English, the definite article is used before the ordinal number:

Charles II Charles the second
Henry VIII Henry the Eighth

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	40th fortieth
13th thirteenth	50th fiftieth
14th fourteenth	60th sixtieth
15th fifteenth	70th seventieth
16th sixteenth	80th eightieth
17th seventeeth	90th ninetieth
18th eighteenth	100th one hundredth
19th nineteenth