first第一1st

second第二2nd

third第三3rd

fourth第四4th

fifth第五5th

sixth第六6th

seventh第七7th

eighth第八8th

ninth第九9th

tenth第十10th

eleventh第十一11th

twelfth第十二12th

thirteenth第十三13th

fourteenth第十四14th

fifteenth第十五15th

sixteenth第十六16th

seventeenth第十七17th

eighteenth第十八18th

nineteenth第十九19th

twentieth第二十20th

twenty-first第二十一21st

twenty-second第二十二22nd

twenty-third第二十三23rd

thirtieth第三十30th

thirty-first第三十一31st

fortieth第四十40th

fiftieth第五十50th

sixtieth第六十60th

seventieth第七十70th

eightieth第八十80th

ninetieth第九十90th

(one)hundredth第一百100th