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1、什么是数词？表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。基数词onetwothreefourfivesixseveneightsevensixthreezeroninetwooneeightfourfivenumberssevensixthreezeroninetwooneeightfourfive最基本的数词如下:1one,2two,3three,4four,5five,6six,7seven,8eight,9nine,10ten,11eleven,12twelve,13thirteen,14fourteen,15f
2、ifteen,16sixteen,17seventeen,18eighteen,19nineteen,20twenty,30thirty,40forty,50fifty,60sixty,70seventy,80eighty,90ninety,100ahundred, 1,000athousand, 1,000,000amillion, 1,000,000,000abillion.从事物内容上分析，基数词用在下列情况。1)编号的事物用基数词。TodaywearegoingtostudyLessonFive.今天我们要学习第五课。Pleaseopenyourbooksatpageten
3、.请打开书，翻到十页。WeliveinRoom101.我们住在101房间。2)表示“年，月，日”时用基数词。Theaccidenttookplacein1982.这次事故发生在一九八二年。IwasborninOct.11,1956.我出生在一九五六年，十月，十一日。YoucouldseemanyflowersinJune.六月份你可以看到好多花。3)表示“几点钟，几点过几分”用基数词。It'sthreeo'clock.现在是三点钟。Itistwototwo.现在是两点差两分。WearrivedinBeijingatfivetoseven.我们七点差五分到达北京。4)用于加减乘除的数字
4、用基数词。Oneplustwoisthree.一加二等于五。Eightminusfourisfour.八减四等于四。Twotimestwoisfour.二乘二等于四。Tendividedbytwoisfive.十除以二等于五。5)表示大几倍或者小几倍用基数词。Thisriveristwotimeslongerthanthatone.这条河比那条河长两倍。Thisboxisfivetimeslessthanthatone.这个盒子比那个盒子小五倍。Fivetimessixisthirty.五乘以六得三十。6)表示百分数用基数词。Thirtypercentofthemiswater.它们
5、当中有30%的水。Eightypercentofwhathesaidistrue.他的话有80%是真实的。7)表示分数时，分子数字用基数词,但分母要用序数词,如分子不是1，序数词要用复数形式。One-fifthofthebooksaremine.三分之一的书是我的。Three-tenthsofwaterisdisappeared.十分之三的水不见了。8)表示有小数的词用基数词。5.5fivepointfive12.135twelvepointonethreefiveNumbersarewidelyused.Hello，86861873---Let’scount!1-10onetwot
6、hreefourfivesixseveneightnineten11-19eleventwelvethirteenforteenfifteensixteenseventeeneighteennineteenLet’sreview102030405060708090100tenthirtyfortyseventysixtyOnehundredfiftyninetytwentyeightyDragon1-1001324LookandRead100onehundred1,000onethousand1,000,000onemillion1,000,000,000onebillion1002
7、,00030,000400,0005,000,00060,000,000 700,000,0008,000,000,00090,000,000,000100,000,000,000Canyoureadthem?hundredthousandmillionbillionone hundredonethousandten thousandone hundred thousandonemillionten millionone hundred
