Cardinal numbers         Ordinal numbers
0 oh, zero
1 one                          1st first
2 two                          2nd second
3 three                        3rd third
4 four                         4th fourth
5 five                          5th fifth
6 six                           6th sixth
7 seven                      7th seventh
8 eight                        8th eighth
9 nine                         9th ninth
10 ten                       10th tenth
11 eleven                  11th eleventh
12 twelve                  12th twelfth
13 thirteen                 13th thirteenth
14 fourteen               14th fourteenth
15 fifteen                  15th fifteenth
16 sixteen                 16th sixteenth
17 seventeen             17th seventeenth
18 eighteen                18th eighteenth
19 nineteen               19th nineteenth
20 twenty                 20th twentieth
21 twenty-one          21st twenty-first
30 thirty                   30th thirtieth
40 forty
50 fifty
60 sixty
70 seventy
80 eighty
90 ninety
100 a/one hundred
1,000 a/one thousand
10,000 ten thousand
100,000 a/one hundred thousand
1,000,000 a/one million
1,000,000,000 a/one billion

By Fábio