1、数词num数词分类基数词：表示人或事物的个数 多少个多少个序数词：表示人或事物先后顺序第几第几个个基数词的构成112有各自独立的单词1 one5 five9nine2 two6 six10ten3 three 7 seven 11eleven4 four 8 eight 12twelve1319的基数词以-teen结尾13 thirteen 16 sixteen14 fourteen17 seventeen15 fifteen18 eighteen19 nineteen2090的整十数以-ty结尾20twenty50fifty80eighty30thirty60sixty90ninety40f
2、orty70seventy2199之间非整十数基数词个十位之间用连字符“-”表示21twenty-one32thirty-two43forty-three66sixty-six101999的基数词的表达方式：基数词基数词+hundred+and+整十位数整十位数+连连字符字符+个位数个位数256：two hundred and fifty-six450:four hundred and fifty109:one hundred and eight1000以上的基数词1,000 one thousand1,001 one thousand and one1,813 one thousand,ei
3、ght hundred and thirteen5,123,456,789 five billion,one hundred and twenty-three million,four hundred and fifty-six thousand,seven hundred and eighty-nine序数词13第第1 first1st第2 second 2nd第3 third3rd第第4fourth4th第第12 twelfth12th第5fifth5th第13 thirteenth13th第6sixth6th第14 fourteenth14th第7seventh7th第15 fiftee
4、nth15th第8eighth8th第16 sixteenth16th第9ninth9th第17 seventeenth 17th第10 tenth10th 第18 eighteenth18th第11 eleventh 11th 第19 nineteenth19th整十数的序数词第第20twentieth20th第第60sixtieth60th第30thirtieth30th第70seventieth 70th第40fortieth 40th第80eightieth80th第50fiftieth 50th第90ninetieth90th非整十数的序数词第21 twenty-first 21st
5、第32 thirty-second 32nd第43 forty-third 43rd第99 ninety-ninth 99th100和100以上的序数词第100 one hundredth 100th第101 one hundred and first 101st数词的基本用法 分数分子用基数词，分母用序数词。分子大于1时，分母的序数词要用复数形式。1/2 one half 或a half1/4 one fourth或 a quarter 2/3 two thirds二又三分之四 two and three fourths或 two and three quarters 小数小数点读point，小数点前的数与基数词的读法一致，小数点后的数字一一读出一一读出。0.05 :zero point zero five0.36 :zero point three six28.23:twenty-eight point two three百分数百分数用基数词加百分号表示，百分号读作percent。50%fifty percent35%thirty-five percent100%one hundred percent
