first第一1stsecond第二2ndthird第三3rdfourth第四4thfifth第五5thsixth第六6thseventh第七7theighth第八8thninth第九9thtenth第十10theleventh第十一11thtwelfth第十二12ththirteenth第十三13thfourteenth第十四14thfifteenth第十五15thsixteenth第十六16thseventeenth第十七17theighteenth第十八18thnineteenth第十九19thtwentieth第二十20thtwenty-first第二十一21sttwenty-second第二十二22ndtwenty-third第二十三23rdthirtieth第三十30ththirty-first第三十一 31stfortieth第四十40thfiftieth第五十50thsixtieth第六十60thseventieth第七十70theightieth第八十80thninetieth第九十90th(one)hundredth第一百100th