st first 11th eleventh 21st twenty-first
2nd second 12th twelfth 22nd twenty-second
3rd third 13th thirteenth 23rd twenty-third
4th fourth 14th fourteenth 24th twenty-fourth
5th fifth 15th fifteenth 25th twenty-fifth
6th sixth 16th sixteenth 26th twenty-sixth
7th seventh 17th seventeenth 27th twenty-seventh
8th eighth 18th eighteenth 100th one hundredth
9th ninth 19th nineteenth 1,000th one thousandth
10th tenth 20th twentieth 1,000,000th one millionth