英语中基数词、序数词、分数、小数和百分数的读法1.基数词的读法：A.先说“几十”，再说“几”，中间用连字符。如：23—89—B.先说“几百”，再加and,再加末两位数（或末位数）。如：223—416—809—twenty-threeeighty-ninetwohundredandtwenty-threefourhundredandsixteeneighthundredandnineC.1000以上的数先从后向前数，每三位数加一“,”（千分位）；第一个“,”号前为thousand;第二个“,”号前为million;第三个“,”号前为billion。如：1,001—4,000—9,743—174,301—750,000,000—onethousandandonefourthousandninethousand,sevenhundredandforty-threea(one)hundredandseventy-fourthousand,threehundredandonesevenhundredandfiftymillion2.序数词的读法序数词一般以与之相应的基数词加词尾-th构成，如：tenth（第十），但下面这些基数词在变序数词时，有特别的地方。如：A.one—two—three—five—eight—nine—twelve—firstsecondthirdfiftheighthninthtwelfthB.以-ty结尾的词，要先变-y为-i，再加-eth。如：twenty—forty—C.以one,two,three,five,nine收尾的多位数词，要照第一条方法变。如：twenty-one—twenty-two—thirty-five—ninety-nine—ahundredandfifty-three—twentiethfortiethtwenty-firsttwenty-secondthirty-fifthninety-ninthahundredandfifty-third基数词表示分子，序数词表示分母，除了分子是“1”的情况外，序数词要用复数。如：¼—2/3—7/9—5/12———one-fourthtwo-thirdsseven-ninthsfive-twelfthstwoandthree-fifthsthirtyandseven-eighths3.分数词的读法2353078一些特殊的表达法½—¼—¾—a/onehalfa/onequarterthreequarters4.小数的读法7.8—0.4—0.03—0.125—14.397—sevenpointeightzeropointfourzeropointzerothreezeropointonetwofivefourteenpointthreenineseven5)百分数的读法27%—45%—86%—twenty-sevenpercentforty-fivepercenteighty-sixpercentCanyousaythefollowinginEnglishcorrectly?1,0002,00012,000112,000796,000onethousandtwothousandtwelvethousandonehundred,twelvethousandsevenhundred,ninetysixthousand879,457eighthundred,seventy-ninethousand,fourhundredandfifty-seven1,000,0009,000,00032,000,000212,000,000onemillionninemillionthirty-twomilliontwohundred,twelvemillion988,766,688ninehundred,eighty-eightmillion,sevenhundred,sixty-sixthousand,sixhundredandeighty-eight987,654,321ninehundred,eighty-sevenmillion,sixhundred,fifty-fourthousand,threehundredandtwenty-one1,000,000,000onebillion9,000,000,000ninebillion32,000,000,000thirty-twobillion564,865,000,000fivehundred,sixty-fourbillion,eighthundred,sixty-fivemillion978,876,675,467ninehundred,seventy-eightbillion,eighthundred,seventy-sixmillion,sixhundred,seventy-fivethousand,fourhundredandsixty-seven2112fractionWewrite1/51/61/74/7Wesayonefifthonesixthoneseventhfoursevenths7/1097/111sevententhsninety-sevenonehundredandelevenths45/87forty-fiveeighty-sevenths总结:你能看出他们有什么特点吗？分子用基数词,分母用序数词;分子大于1,分母的序数词需要加s。另外,还有几个特殊表达的情况:1/21/41/33/42/3onehalfonequarteronethirdthreequarterstwothirds50%25%75%百分数：percentagePracticeNowlet’ssay:2/55/89/103/85/6two-fifthsfive-eighthsnine-tenthsthree-eighthsfive-sixthsCanyousaythefollowinginEnglishcorrectly?CanyousaythefollowinginEnglishcorrectly?0.50.80.761.23pointfivepointeightpointsevensixonepointtwothree23.45100.3287.6757.564twenty-threepointfourfiveonehundredpointthreetwoeighty-sevenpointsixsevenfivesevenpointfivesixfourpointpointpointpoint总结：小数点用pointFillintheblankswithnumbers1.W:Whyareyousoexcited?M:I’mgoingtobuyatelevisionset.Theyusuallycost____dollars,buttodaytheyareonsalefor_________theprice300tow-thirds2.W:DidyouknowKoreahasapopulationof__________?M:That’snothingspecial.IndiahasninetimesasmanypeopleasKorea100million3.M:That’s____dollarsonthemeter(记程器）,andadollarforthesuitcaseW:Okay.Hereis____dollars,keepthechange.five3.254.M:Ourrentisnowjust600dollarsamonth.W:Iknow.It’sexactly_________morethanitwaswhenwefirstmovedin.one-third5.W:Isthisthebookcaseyouadvertised?M:Yes.It’sourregular______dollarsbookcaseonsaletodayfor____dollars.Thesearethelasttwo.Ifyouusethembothyoucanhavethepainfor15dollars.14.959.906.W:Canyoutellmewhyyouchargedme6.60dollarsona____dollarsbag?Didyoumakeamistake?M:No,Madam.That’s____salestax.Maybeyouarefromoutoftownanddon’tknowaboutit.6.0010%Readthesequestionsaloudandsaytheanswers.1.Whatis½of6,000,000?2.Howmuchis35,246,000plus12,800,000?3.Whatis25%of200,000,000?threemillionforty-eightmillion,forty-sixthousandfiftymillion4.Howmuchis260,408,396and5,284,700?twohundred,sixty-fivemillion,sixhundred,ninety-threethousand,ninety-six5.Whatis¾of1,000,500,000?sevenhundred,fiftymillion,threehundred,seventy-fivethousand6.Whatis10%of800,000,000?eightymillionHomeworkFinishExercise9onP93.
