Numbers

Abaixo está a relação dos números cardinais e ordinais em inglês. Compare:

Cardinal	Ordinal
1 One	1o First
2 Two	2o Second
3 Three	3o Third
4 Four	4o Fourth
5 Five	5o Fifth
6 Six	6o Sixth
7 Seven	7o Seventh
8 Eight	8o Eighth
9 Nine	9o Ninth
10 Tem	10o Tenth
11 Eleven	11o Eleventh
12 Twelve	12o Twelfth
13 Thirteen	13o Thirteenth
14 Fourteen	14o Fourteenth
15 Fifteen	15o Fifteenth
16 Sixteen	16o Sixteenth
17 Seventeen	17o Seventeenth
18 Eighteen	18o Eighteenth
19 Nineteen	19o Nineteenth
20 Twenty	20o Twentieth
21 Twenty-one	21o Twenty-first
22 Twenty-two	22o Twenty-second
30 Thirty	30o Thirtieth
40 Forty	40o Fortieth
50 Fifty	50o Fiftieth
60 Sixty	60o Sixtieth
70 Seventy	70o Seventieth
80 Eighty	80o Eightieth
90 Ninety	90o Ninetieth
100 One (A) Hundred	100o One hundredth
101 One Hundred one	101o One hundred-first
200 Two Hundred	200o Two hundredth
300 Three Hundred	300o Three hundredth
1,000 One (A) Thousand	1,000o One thousandth
1,000,000 One Million	1,000,000 One millionth
1,000,000,000 One Billion	1,000,000,000 One billionth

Percebe-se facilmente que os números ordinais são formados com o acréscimo do sufixo th. No entanto, tome cuidado pois alguns números mudam a grafia: twelfth, ninth.