Ordinal Numbers.

 

Words

Just add th to the cardinal number:
:

• four – fourth
• eleven – eleventh

Exceptions:

• one – first
• two – second
• three – third
• five – fifth
• eight – eighth
• nine – ninth
• 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
• second = 2nd
• third = 3rd
• fourth = 4th
• twenty-sixth = 26th
• hundred and first = 101st

Titles

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

• Charles II – Charles the Second
• Edward VI – Edward the Sixth
• Henry VIII – Henry the Eighth

Check pronunciation of numbers

Exercise on spelling of Ordinal Numbers

In case you need it, here you are a full table of ordinal numbers from 1st to 1,000,000th

Numbers

1	st	first	16	th	sixteenth
2	nd	second	17	th	seventeenth
3	rd	third	18	th	eighteenth
4	th	fourth	19	th	nineteenth
5	th	fifth	20	th	twentieth
6	th	sixth	21	st	twenty-first
7	th	seventh	22	nd	twenty-second
8	th	eighth	23	rd	twenty-third
9	th	ninth	24	th	twenty-fourth
10	th	tenth	25	th	twenty-fifth
11	th	eleventh	26	th	twenty-sixth
12	th	twelfth	27	th	twenty-seventh
13	th	thirteenth	28	th	twenty-eighth
14	th	fourteenth	29	th	twenty-ninth
15	th	fifteenth	30	th	thirtieth

31	st	thirty-first
40	th	fortieth
50	th	fiftieth
60	th	sixtieth
70	th	seventieth
80	th	eightieth
90	th	ninetieth
100	th	one hundredth
1,000	th	one thousandth
1,000,000	th	one millionth