英文数字的表达和用法讲稿.ppt

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1、关于英文数字的表达和用法第一页，讲稿共五十页哦表示数目多少或顺序多少的词叫数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。表示词，数词分为基数词和序数词。表示数目多少的数词叫数目多少的数词叫基数词基数词；表示顺序；表示顺序的数词叫的数词叫序数词序数词。2第二页，讲稿共五十页哦1 基数词（基数词（cardinal number）第三页，讲稿共五十页哦1 one2two 3three4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten111213141516171819 eleven twelve thirteen fourteen fif

2、teen sixteen seventeen eighteen nineteen2030405060708090100 twenty thirty forty fifty sixty seventy eighty ninetyone hundred 第四页，讲稿共五十页哦基数词的构成基数词的构成1）112,独立成词。独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13-19,由由39+teen构成。构成。14fourteen16-sixteen17-seventeen19nineteen特殊拼写特殊拼写:13thirteen1

3、5-fifteen18eighteen3）2090,以以-ty结尾。结尾。20twenty30-thirty40forty50fifty60-sixty70-seventy80-eighty90ninety 4）2199，两位数，十位与个位之间有两位数，十位与个位之间有“-”。21twenty-one55fifty-five99ninety-nine5）101999，三位数，百位与十位，三位数，百位与十位/个位之间加个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three 5第五页，讲稿共五十

4、页哦297hundredand基数词基数词三位数三位数 的构成的构成6 twenty-nine729 hundred and and seven 第六页，讲稿共五十页哦035hundredand再来一个7 three503 hundred and and five 第七页，讲稿共五十页哦基数词基数词三位数三位数 的构成的构成8 hundred and and 百位数百位数 十十/个位数个位数个位数个位数four hundred andand thirty-twoone hundred andand seventyeight hundred andand sixty-fiveone hundre

5、d andand nine109432170865第八页，讲稿共五十页哦作业作业339126203451704178926854703151309326703651307428第九页，讲稿共五十页哦注：注：1、1000以上几个的词，每三位数加一以上几个的词，每三位数加一个逗号，第一个逗号前的数为个逗号，第一个逗号前的数为thousand，第，第二个逗号前的数为二个逗号前的数为million（百万）（百万）,第三个第三个逗号前的数为逗号前的数为billion（十亿），第四个逗号前（十亿），第四个逗号前的数为的数为trillion（万亿）（万亿）888,888，888，888，888eight h

6、undred and eighty-eight trillion,eight hundred and eighty-eight billion,eighthundredandeighty-eightmillion,eighthundredandeighty-eightthousand,eighthundredandeighty-eight第十页，讲稿共五十页哦trilliontrljn万亿万亿billionbljn十亿十亿millionmljn百万百万thousandaznd千千hundredhndrd百百第十一页，讲稿共五十页哦29,43150076,thousand,hundredmill

7、ion,billion,and6)1，000以上数目以上数目,从右向左每三位用从右向左每三位用“，”分开分开,分别读为分别读为thousand,million,billion 千 百万 十亿基数词的构成基数词的构成12第十二页，讲稿共五十页哦基数词的构成基数词的构成6 500 431 7296 500 431 729six six billionbillion,five hundred five hundred millionmillion,four hundred and four hundred and thirty-one thirty-one thousandthousand,seve

8、n hundred and twenty-seven hundred and twenty-ninenine第十三页，讲稿共五十页哦four thousand,three hundred and twenty-oneseven million,six hundred and fifty four thousand,three hundred and twenty-one7,654,3211,987,654,32143214,321one billion,nine hundred and eighty-seven million,six hundred and fifty-four thousa

9、nd,three hundred and twenty-one第十四页，讲稿共五十页哦1.hundred thousand (表示具体数字表示具体数字)million billion2.hundreds thousands (表示概数表示概数)millions billions三三.基数词的用法基数词的用法数词数词(several)+)+ofthe/some/many/these/thosethe/some/many/these/those hundreds of第十五页，讲稿共五十页哦基数词的用法基数词的用法1、表示表示具体具体数目数目,hundred,thousand,million不用复

10、数不用复数表示表示不确定不确定数目数目,用用复数。复数。即即hundredsof(数百数百),thousandsof(数千数千),millionsof(数百万数百万)+名词复数。名词复数。1)Ourcountryhasapopulationof1,300millionpeople.2)Thereareseveralthousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.第十六页，讲稿共五十页哦作业作业7046534210178346790125432130742832165476704653421817

11、03467931204321309428320654第十七页，讲稿共五十页哦warmingup1._tresswereplantedonthemountainlastyear.A.ThousandsofB.ThousandofC.FivethousandofD.Fivethousands.2_ofthestudentsaregirlsinourclassATwothreeBTwothreesCTwothirdsDSecondthree3.-Whenwasheborn?-Hewasbornon_.A.secondofOctoberB.theOctoberthreeC.Octobertheseco

12、ndD.threeofOctober18第十八页，讲稿共五十页哦1.If a=3,b=4,whats the answer to the problem,a+2ab+1=?the answer is_.A.twenty eight B.twenty-eighth C.twenty-eight2.In our school about five _ students are able to surf the Internet.A.hunderd of B.hunderds of C.hundred第十九页，讲稿共五十页哦3._ sheep were killed in the accident.

13、A.Thousand of B.Thousand C.Thousands of4.There are over nine _ workers in the factory,but _ of young people hope to work in it.A.hundred 0f;hundreds B.hundred;hundreds C.hundreds;hundred第二十页，讲稿共五十页哦5.5.people in the world are sending people in the world are sending information by e-mail every day.in

14、formation by e-mail every day.A.Several million B.Many millionsA.Several million B.Many millionsC.Several millions D.Many millionC.Several millions D.Many million A第二十一页，讲稿共五十页哦1 基数词（基数词（cardinal number）第二十二页，讲稿共五十页哦序数词的构成序数词的构成1)13,first,second,third。2)419,相应基数词相应基数词+th,fourth,fifth,sixth,seventh,e

15、ighth,ninth,tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth.3)2090,y变成变成ie+th,twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth。4)2199,只把个位的基数词变成序数词只把个位的基数词变成序数词如如twenty-first,ninety-ninth5)序数词缩写序数词缩写-数字最后两字母数字最后两字母如如1st,

16、2nd,3rd,4th第二十三页，讲稿共五十页哦基变序基变序,有规律有规律,词尾加上词尾加上“th”，一、二、三，特殊记，结尾字母一、二、三，特殊记，结尾字母t,d,d八去八去“t”，九去，九去“e”，“f”要把要把ve替替见见“y”变成变成“i”和和“e”，词尾加上，词尾加上“th”，若是遇到几十几，只变个位就可以。若是遇到几十几，只变个位就可以。序数词缩写记清楚序数词缩写记清楚,数字后跟两字母。数字后跟两字母。(序数词构成规律)24第二十四页，讲稿共五十页哦基数词基数词序数词序数词基数词基数词序数词序数词oneonetweltwelvevetwotwotwenttwenty ythreet

17、hreetwentytwenty-one-onefofou ur rfortforty yfi fiveveone hundredone hundredsixsixone hundred one hundred andand five fiveeigheight tone hundred one hundred and twenty-and twenty-ninenineninnine eninnine eteenteen一一.基数词、序数词基数词、序数词firstsecondthirdfourthfifthsixtheighthninthtwelfthtwentiethtwenty-firs

18、tfortiethone hundredthone hundred and fifthone hundred and twenty-ninthnineteenth第二十五页，讲稿共五十页哦时间类型时间类型表示法表示法例例读法读法整点整点基数词（基数词（+oclock)1:0030分钟分钟分钟分钟+past+小时小时 2:10=30 分钟分钟half+past+小时小时3:3030分钟分钟（60-分钟）分钟）+to+（小时（小时+1）4:40分钟逢分钟逢15即即 一刻钟一刻钟a quarter5:156:45简化法简化法按顺序读基数词按顺序读基数词7:50one oclockten past t

19、wohalf past threetwenty to fivea quarter past fivea quarter to sevenseven fifty表示在几点钟用介词表示在几点钟用介词 at数词的表示法数词的表示法 时间时间第二十六页，讲稿共五十页哦1.Its already 7:40 now.When will the film start?_.We still have five minutes.A.A quarter to seven B.A quarter to eight C.Seven past forty-five第二十七页，讲稿共五十页哦 月日年月日年 在在1998年

20、年10月月1日日数词的表示法数词的表示法 年月日年月日on Octorber the first,nineteen ninety-eight日日the+序数词序数词月月（首字母大写）（首字母大写）月日与年之间月日与年之间用用 ，分开分开年年（两位两位读）（两位两位读）on August the ninthin May,two thousand and ten天日用天日用 on 年月用年月用inon Oct.1st,1998月日月日在在8月月9日日月年月年在在2010年年5月月第二十八页，讲稿共五十页哦 1.The accident happened on_.A.April 5,2001 B.2

21、001,April 5 C.April 2001,5 2.I was born _.A.in March 8,1993 B.on July 9,1994 C.on May,1995第二十九页，讲稿共五十页哦20世纪90年代in the 1990s/1990s在他50多岁时 in his fifties数词的表示法数词的表示法 1.1.年代世纪年代世纪in thein ones+整十基数词复数在某人几十岁时nineteennineties第三十页，讲稿共五十页哦2、“基数词基数词+名词名词”的的合成形容词合成形容词作定语，作定语，中间有连字符中间有连字符“”,当中的名词用当中的名词用单数单数。a

22、3yearoldgirlaseven-dayholiday3、表计量、表计量-“基数词基数词+度量单位度量单位+形容词形容词”Theclassroomis7meterslong,6meterswideand3metershigh.31第三十一页，讲稿共五十页哦1.There will be more chances in _ century than in _ century.A.twenty-one,twenty B.twenty-first,twentieth C.the twenty-first,the twentieth2.The city changed a lot _.A.in 1

23、980s B.in the 1980s C.in the 1980第三十二页，讲稿共五十页哦3.He graduated in _ of _ century.A.the sixtieth;twenty B.sixty;the twentieth C.his sixties;the twentieth4.She got the prize _.A.in her fifties B.in fifties C.in her fifty第三十三页，讲稿共五十页哦5.The winner is _.He is an _ boy.A.eight-year-old;eight years old B.eig

24、ht years old;eight-year-old C.eight-years old;eight-year-old6.He came to China _.A.at the age of 20 B.when he is 20 C.at age of 20第三十四页，讲稿共五十页哦7.The river is about _.A.6,000 meters long B.6,000-meters-long C.6,000-meter-longbe+数词数词+度量词度量词+形容词形容词第三十五页，讲稿共五十页哦15分子分子基数词基数词分母分母序数词序数词one fifth27分子分子 1分母分

25、母+stwo sevenths14分子分子a分母分母 quartera quarter34three quarters12a half13three and one third3基数词基数词+and+分数分数数词的表示法数词的表示法 分数百分数分数百分数第三十六页，讲稿共五十页哦80%基数词基数词+percenteighty percent百分数百分数+of+可数名词复数可数名词复数 谓语动词用复数谓语动词用复数百分数百分数+of+不可数名词不可数名词谓语动词用单数谓语动词用单数Seventy percent of students in our class are girlsOver sev

26、enty percent of the earths surface is covered with water第三十七页，讲稿共五十页哦1._ of the students _ boys in Class A.Two three;are B.Two thirds;are C.Two thirds;is2._ of her money _ spent on clothes.A.Two three;are B.Two thirds;is C.Two third;is3._ the teachers in our school is about one hundred,and _ of them

27、 are women teachers.A.The number of;two thirds B.The number of;two third C.A number of;two thirds第三十八页，讲稿共五十页哦一个半小时一个半小时两个半小时两个半小时 two and a half hours=two hours and a half one and a half hours=one hour and a half数词的表示法数词的表示法 半的表示法半的表示法1.The boy always stays there for _.A.three and half hour B.three

28、 hour and a half C.three and a half hours2.The old man drank_ beer.A.two bottles and a half B.two and a half bottle C.two bottle and a half第三十九页，讲稿共五十页哦一倍一倍 onceonce，两倍，两倍 twicetwice，三倍三倍 three timethree times s (三倍或以上三倍或以上 基数词基数词times)times)数词的表示法数词的表示法 倍数倍数This box is five times as big as that one

29、.=This box is four times bigger than that one.A+be+倍数倍数+as+adj.原原+as+B.A是是B的的 倍倍A+be+倍数倍数+adj.比比+than+B.A比比B 倍倍第四十页，讲稿共五十页哦 1.This building is _ that building.A.three time as tall as B.twice taller than C.three times as taller as 2.我的箱子比你的重六倍我的箱子比你的重六倍!My box is _ yours.2.What a table!Ive never seen

30、 such a thing before.It is it is long.A.half not as wide as B.wide not as half asC.not half as wide as D.as wide as not half six times heavier thanseven times as heavy asC第四十一页，讲稿共五十页哦一般编码用一般编码用 名词名词+基数词基数词207房房 三年级一班三年级一班第五部分第五部分第一课第一课3 号汽车号汽车第一中学第一中学Room 207 Class One Grade ThreePart five=the fift

31、h partLesson one=the first lesson Bus No.3=the No.3 busNo.1 Middle School数词的表示法数词的表示法 编号编号1.My mother lives at on floor.A.Room Six;the second B.Six Room;secondC.Room six;two D.the room six;the secondA第四十二页，讲稿共五十页哦(1)(1)小数的读法小数的读法 小数点左边的数通常按基数词读，若为三位以上的数，也可按编码式小数点左边的数通常按基数词读，若为三位以上的数，也可按编码式读法读出，即将数字单

32、个读出；小数点右边的数通常按编码式读法单读法读出，即将数字单个读出；小数点右边的数通常按编码式读法单个读出。如：个读出。如：6.86 six point eight six 6.86 six point eight six 14.15 fourteen point one five 14.15 fourteen point one five(2)(2)小数中小数中“0”0”的读法的读法 “0”0”在小数中通常读作在小数中通常读作noughtnought（英）或（英）或zerozero（美），也可读作字母（美），也可读作字母o o。如：如：0.08 0.08（noughtnought）point

33、 nought eight point nought eight 或或 （zerozero）point zero eight point zero eight 小数表示法小数表示法 第四十三页，讲稿共五十页哦6+511 Six plus five is eleven 或 Six and five is eleven.11-65 Eleven minus six is five.或 Six from eleven is five.4520 Four multiplied by five is twenty.或 Four times five is twenty.2045 Twenty divid

34、ed by four is five.或 Four into twenty goes five.3 Three squared is nine.2 Two cubed is eight.加减乘除式的表达方法加减乘除式的表达方法 23第四十四页，讲稿共五十页哦表示“大约、接近”，常用nearly,about,some,almost,around 等。about 700 people some fifty years ago 表示“左右”用or so In the past five years or so “少于”用less than Less than 30 years old 不到30岁“多

35、于”用 more than,over More than a year ago over 70 years ago约数表示法约数表示法第四十五页，讲稿共五十页哦(1)序数词作定语，前面要加序数词作定语，前面要加the；ThefirsttruckiscarryingafoodbasketJohnlivesonthefifteenthfloorSheismyfirstEnglishteacher.(2)有时加有时加a/an，“再一再一”，“又一又一”的意思的意思WellhavetodoitasecondtimeShallIaskhimathirdtime？WhenIsatdown，afourthm

36、anrosetospeakTheyhadasecondchildin1988序数词的用法序数词的用法46第四十六页，讲稿共五十页哦选择填空。1March is _month of a yearA a three B the third C a third2We will have a meeting at 8:05_Afive to eight B.eight to five Ceight o five3Eight plus eight is_.Asixteen Bsixty-four Cone4He is an _boyAeight years Beight-year-old Ceight-

37、years-old5We will have a_ walkAten minutes Bten minutes Cten-minutesB the thirdCeight o fiveAsixteenBeight-year-oldBten minutes第四十七页，讲稿共五十页哦6The wall is_.Afour meters long Bfour meter long Cfour-meter long7Whats the date today?Its_AMarch the eight BMarch the eighthCeight，March8It happened in the 104

38、0sA in the forties of the eleventh centuryB in the forties of the tenth centuryC in the forty9About_ of the earths surface is covered with water.A.three-fours B.three-fourth C.three-fourthsAfour meters longBMarch the eighthA in the forties of the eleventh centuryC.three-fourths第四十八页，讲稿共五十页哦10.He went down to the village which was _miles away from the city.A.three hundreds B.three hundredC.three hundreds ofB.three hundred第四十九页，讲稿共五十页哦Homework1.Grammar focus textbook(p30)exercise1-22、Workbook(p19)exercise450第五十页，讲稿共五十页哦