1到20为：
first、second、third、fourth、fifth、sixth、seventh、eighth、ninth、tenth、eleventh、twelfth、thirteenth、fourteenth、fifteenth、sixteenth、seventeenth、eighteenth、nineteenth、 twentieth
21到40为：
twenty-first、twenty-second、twenty-third、twenty-fourth、twenty-fifth、twenty-sixth、twenty-seventh、twenty-eighth、twenty-ninth、thirtieth、thirty-first、thirty-second
thirty-third、thirty-fourth、thirty-fifth、thirty-sixth、thirty-seventh、thirty-eighth、thirty-ninth、fortieth
41到60为：
forty-first、forty-second、forty-third、forty-fourth、forty-fifth、forty-sixth、forty-seventh、forty-eighth、forty-ninth、fiftieth、fifty-first、fifty-second、fifty-third、fifty-fourth、fifty-fifth、fifty-sixth、fifty-seventh、fifty-eighth、fifty-ninth、sixtieth
61到80为：
sixty-first、sixty-second、sixty-third、sixty-fourth、sixty-fifth、sixty-sixth、sixty-seventh、sixty-eighth、sixty-ninth、seventieth、seventy-first、seventy-second、seventy-third
seventy-fourth、seventy-fifth、seventy-sixth、seventy-seventh、seventy-eighth、seventy-ninth、eightieth
81到100为：
eighty-first、eighty-second、eighty-third、eighty-fourth、eighty-fifth、eighty-sixth、eighty-seventh、eighty-eighth、eighty-ninth、ninetieth、ninety-first、ninety-second
ninety-third、ninety-fourth、ninety-fifth、ninety-sixth、ninety-seventh、ninety-eighth、ninety-ninth、one hundredth
扩展资料：
序数词记忆歌诀：
第1、2、3、12单独记
第五第九均无e
整十y变ie，然后再加-th
整十带个是“基 + 序”； 其余直接加-th
说明：序数词有两种写法：
①用英语单词
②用“
阿拉伯数字+词尾-st/-nd/-r/-th
first—1st eleventh—11th twenty-first—21st
second—2nd twelfth—12th twenty-second—22nd third—3rd
thirteenth—13th twenty-third—23rd
fourth4—4th fourteenth—14th twenty—fourth 24th
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