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1、外研版高一年级(必修1)Module5Module5ALessoninaLabVocabularyandspeaking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“几十”，再“几”，中间用连字符。e.g.23—89—B.先“几百”，再加and,再加末两位。e.g.223—416—809—twenty-threeeighty-ninetwohundredandtwenty-threefourhundredandsixteeneighthundredandnineC.1000以上的数从后向前数，每三位数加“,”；第一个“,”号前为thousand;
2、第二个“,”号前为million;第三个“,”号前为billion。e.g.1,001—9,743—750,000,000—onethousandandoneninethousand,sevenhundredandforty-threesevenhundredandfiftymillion2.序数词的读法序数词一般以与之相应的基数词加-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。A.one—two—three—five—eight—nine—twelve—firstsecondthirdfiftheighthninthtwelfthB.以
3、-ty结尾的词，先变-y为-i，再加-eth。e.g.twenty—forty—C.以one,two,three,five,nine收尾的多位数词，要照第一条方法变。e.g.twenty-one—twenty-two—ninety-nine—ahundredandfifty-three—twentiethfortiethtwenty-firsttwenty-secondninety-ninthahundredandfifty-third基数词表示分子，序数词表示分母，分子大于1时，序数词要用复数。e.g.1/4—2/3—7/9—5/12—one-fourthtwo-thi
4、rdsseven-ninthsfive-twelfths3.分数词的读法特殊的表达法½—¼—¾—a/onehalfa/onequarterthreequarters4.小数的读法7.8—0.125—14.397—sevenpointeightzeropointonetwofivefourteenpointthreenineseven5.百分数的读法27%—45%—86%—twenty-sevenpercentforty-fivepercenteighty-sixpercentCanyousaythefollowinginEnglishcorrectly?1,0002,00
5、012,000112,000796,000onethousandtwothousandtwelvethousandonehundred,twelvethousandsevenhundred,ninety-sixthousand879,457eighthundred,seventy-ninethousand,fourhundredandfifty-seven1,000,0009,000,00032,000,000212,000,000onemillionninemillionthirty-twomilliontwohundred,twelvemillionReadthese
6、questionsaloudandsaytheanswers.Whatis1/2of6,000,000?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.Whatis¾o
7、f1,000,500,000?sevenhundred,fiftymillion,threehundred,seventy-fivethousand6.Whatis10%of800,000,000?eightymillion1/51/61/74/7onefifthonesixthoneseventhfourseventhsCanyousaythefollowinginEnglishcorrectly?7/1097/111sevententhsninety-sevenonehundredandeleventhsforty-fiv
