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1、英语第一册外研版顶效开发区中学周兴梅MODULE5VOCABULARYANDSPEAKING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）；
2、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,threehundredandonesevenhundredandfiftymillionCanyousaythefollowinginEngli
3、shcorrectly?1,0002,00012,000112,000796,000onethousandtwothousandtwelvethousandonehundredandtwelvethousandsevenhundredandninety-sixthousand988,766,688ninehundredandeighty-eightmillion,sevenhundredandsixty-sixthousand,sixhundredandeighty-eight2.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
4、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-thre
5、e—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.分数的读法2353078一些特殊的表达法½—¼—¾—a/onehalfa/
6、onequarterthreequarters4.小数的读法7.8—2.4—3.03—0.125—14.397—sevenpointeighttwopointfourthreezeropointzerothreezeropointonetwofivefourteenpointthreenineseven5.百分数的读法27%—45%—86%—twenty-sevenpercentforty-fivepercenteighty-sixpercentLet’shaveamatchtoseewhocansaythefollowingnumb
7、erscorrectlyandquickly.765,847sevenhundredandsixty-fivethousand,eighthundredandforty-sevenPractice978,876,675,467ninehundredandseventy-eightbillion,eighthundredandseventy-sixmillion,sixhundredandseventy-fivethousand,fourhundredandsixty-seven1,000,000,000onebillion32,000
8、,000,000thirty-twobillion564,865,000,000fivehundredandsixty-fourbillion,eighthundredandsixty-fivemillion897,78
