Unit2NumbersGrammarLead-in:answerquestions.1Howoldareyou？I'm13yearsold.2What'syourtelephonenumber?Mytelephonenumberis27227854.3Howmanystudentsinyourclass?Howmanystudentsinyourgrade?Thereare52studentsinmyclassandabout310studentsinourgrade.4Inwhichyearwereyouborn?In1999/2000/2001.以上的数字都是基数词（cardinalnumbers）.A.Doyouknow!Cardinalnumbers12345678171819201112131415169103040528598onetwothreefourfivesixseveneightnineteneleventwelevethirteenfourteenfifteensixteenseventeeneighteennineteentwentythirtyfortyfifty-twoeighty-fiveninety-eight基数词的构成1）1－12,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13--19,由3－9+teen构成。14–fourteen16--sixteen17--seventeen19—nineteen特殊拼写:13–thirteen15--fifteen18—eighteen3）20－90,以-ty结尾。20—twenty30---thirty40—forty50—fifty80---eighty60---sixty70---seventy90—ninety4）21－99，两位数，十位与个位之间有“－”。21twenty—one55fifty—five99ninety—nineLet’splayagame：报数Saynumbersonebyoneaccordingtotheseatorder.按照座位顺序一个接一个报数。报错数的同学站着，并要在小组得分上扣一分。100375200onehundredtwohundredthreehundredandseventy-five642958236sixhundredandforty-twoninehundredandfifty-eighttwohundredandthirty-six5）101—999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three29,43150076,,thousandhundredmillionbillionand6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion基数词的构成Readthefollowingnumbers.2,53425,342253,4232,534,233twothousandfivehundredandthirty-fourtwenty-fivethousandthreehundredandforty-twotwohundredandfifty-threethousandfourhundredandtwenty-threetwomillionfivehundredandthirty-fourthousandtwohundredandthirty-three534fivehundredandthirty-four2,250,342,330twobilliontwohundredandfiftymillionthreehundredandforty-twothousandthreehundredandthirtyA.let'sreadit.100015，3624,189onethousandfourthousandonehundredandeighty-ninefifteenthousandthreehundredandsixty-two100，000285，643onehundredthousandtwohundredand...
