英文数字的表达和用法.ppt

关于英文数字的表达和用法现在学习的是第1页，共50页表示数目多少或顺序多少的词叫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，数词分为基数词和序数词。表示数目多少的数词叫多少的数词叫基数词基数词；表示顺序的数；表示顺序的数词叫词叫序数词序数词。2现在学习的是第2页，共50页 1 基数词（基数词（cardinal number）现在学习的是第3页，共50页1 one two three4 four 5 five 6 six 7 seven 8 eight 9 nine 10 ten111213141516171819 eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen2030405060708090100 twenty thirty forty fifty sixty seventy eighty ninetyone hundred 现在学习的是第4页，共50页基数词的构成基数词的构成1）112,独立成词。独立成词。one two three four five six seven eight nine ten eleven twelve2）13-19,由由39+teen构成。构成。14fourteen 16-sixteen 17-seventeen 19nineteen 特殊拼写特殊拼写:13 thirteen 15-fifteen 18eighteen 3）2090,以以-ty结尾。结尾。20twenty 30-thirty 40forty 50fifty 60-sixty 70-seventy 80-eighty 90ninety 4）2199，两位数，十位与个位之间有两位数，十位与个位之间有“-”。21 twentyone 55 fifty-five 99 ninety-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。101 one hundred and one 840 eight hundred and forty 693 six hundred and ninety-three 5现在学习的是第5页，共50页297and基数词基数词三位数三位数 的构成的构成6 twenty-nine729 and seven 现在学习的是第6页，共50页035and再来一个7 three503 and five 现在学习的是第7页，共50页基数词基数词三位数三位数 的构成的构成8 and and and and and 109432170865现在学习的是第8页，共50页作业作业339126203451704178926854703151309326703651307428现在学习的是第9页，共50页注：注：1、1000以上几个的词，每三位数加一个以上几个的词，每三位数加一个逗号，第一个逗号前的数为逗号，第一个逗号前的数为thousand，第二，第二个逗号前的数为个逗号前的数为million（百万）（百万）,第三个逗号第三个逗号前的数为前的数为billion（十亿），第四个逗号前的（十亿），第四个逗号前的数为数为trillion（万亿）（万亿）888,888，888，888，888eight hundred and eighty-eight trillion,eight hundred and eighty-eight billion,eight hundred and eighty-eight million,eight hundred and eighty-eight thousand,eight hundred and eighty-eight现在学习的是第10页，共50页trillion trljn 万亿万亿billion bljn 十亿十亿million mljn 百万百万thousand aznd 千千hundredhndrd 百百现在学习的是第11页，共50页29,43150076,thousand,hundredmillion,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现在学习的是第12页，共50页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,seven seven hundred and twenty-ninehundred and twenty-nine现在学习的是第13页，共50页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 thousand,three hundred and twenty-one现在学习的是第14页，共50页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/those hundreds of现在学习的是第15页，共50页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hundreds of(数百数百),thousands of(数千数千),millions of(数百万数百万)+名词复数。名词复数。1)Our country has a population of 1,300 million people.2)There are several thousand students in our school.3)After the war,thousands of people became homeless.现在学习的是第16页，共50页作业作业704653421017834679012543213074283216547670465342181703467931204321309428320654现在学习的是第17页，共50页warming up1._ tress were planted on the mountain last year.A.Thousands of B.Thousand of C.Five thousand of D.Five thousands.2_ of the students are girls in our class ATwo three BTwo threes CTwo thirds DSecond three3.-When was he born?-He was born on _.A.second of October B.the October three C.October the second D.three of October18现在学习的是第18页，共50页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现在学习的是第19页，共50页3._ sheep were killed in the accident.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现在学习的是第20页，共50页5.5.people in the world are sending people in the world are sending information by e-mail every day.information 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现在学习的是第21页，共50页 1 基数词（基数词（cardinal number）现在学习的是第22页，共50页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,eighth,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,2nd,3rd,4th现在学习的是第23页，共50页基变序基变序,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现在学习的是第24页，共50页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 ythreethreetwentytwenty-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-firstfortiethone hundredthone hundred and fifthone hundred and twenty-ninthnineteenth现在学习的是第25页，共50页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 twohalf 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 atat数词的表示法数词的表示法 时间时间现在学习的是第26页，共50页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现在学习的是第27页，共50页 月日年月日年 在在1998年年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 onon 年月用年月用ininon 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月月现在学习的是第28页，共50页 1.The accident happened on_.A.April 5,2001 B.2001,April 5 C.April 2001,5 2.I was born _.A.in March 8,1993 B.on July 9,1994 C.on May,1995现在学习的是第29页，共50页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nineteen nineties现在学习的是第30页，共50页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 3 year old girl a seven-day holiday 3、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”The classroom is 7 meters long,6 meters wide and 3 meters high.31现在学习的是第31页，共50页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 1980s B.in the 1980s C.in the 1980现在学习的是第32页，共50页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现在学习的是第33页，共50页5.The winner is _.He is an _ boy.A.eight-year-old;eight years old B.eight 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现在学习的是第34页，共50页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+形容词形容词现在学习的是第35页，共50页1 15 5分子分子 基数词基数词分母分母 序数词序数词one fifthone fifth2 27 7分子分子 1 1分母分母 +s+stwo seventhtwo sevenths s1 14 4分子分子 a a分母分母 quarterquartera quartera quarter3 34 4three quarterthree quarters s1 12 2a halfa half1 13 3threethree andand one third one third3 3基数词基数词 +and+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现在学习的是第36页，共50页80%80%基数词基数词 +percent percenteighty 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 Seventy percent of studentsstudents in our class in our class areare girls girlsOver seventy percent of the earths Over seventy percent of the earths surface issurface is covered with water covered with water现在学习的是第37页，共50页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 are women teachers.A.The number of;two thirds B.The number of;two third C.A number of;two thirds现在学习的是第38页，共50页一个半小时一个半小时两个半小时两个半小时 two two andand a half hour a half hours s=two hour=two hours s andand a half a half one one andand a half hour a half hours s=one hour=one hour andand a half 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 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现在学习的是第39页，共50页一倍一倍 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.=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 倍倍现在学习的是第40页，共50页 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 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现在学习的是第41页，共50页一般编码用一般编码用 名词名词 +基数词基数词207207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 3 号汽车号汽车第一中学第一中学Room 207 Room 207 Class One Grade ThreeClass One Grade ThreePart five=the fifth partPart five=the fifth partLesson one=the first lesson Lesson one=the first lesson Bus No.3=Bus No.3=the No.3 busthe No.3 busNo.1 Middle SchoolNo.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现在学习的是第42页，共50页(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，即将数字单个读出；小数点右边的数通常按编编码式读法读出，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：码式读法单个读出。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（美），也可读作字母字母o o。如：。如：0.08 0.08（noughtnought）point nought eight point nought eight 或或 （zerozero）point zero eight point zero eight 小数表示法小数表示法 现在学习的是第43页，共50页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 divided 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现在学习的是第44页，共50页表示“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“多于”用 more than,over More than a year ago over 70 years ago约数表示法约数表示法现在学习的是第45页，共50页(1)序数词作定语，前面要加序数词作定语，前面要加the；The first truck is carrying a food basket John lives on the fifteenth floor She is my first English teacher.(2)有时加有时加a/an，“再一再一”，“又一又一”的意思的意思Well have to do it a second time Shall I ask him a third time？When I sat down，a fourth man rose to speakThey had a second child in 1988序数词的用法序数词的用法46现在学习的是第46页，共50页选择填空。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-years-old5We will have a_ walkAten minutes Bten minutes Cten-minutesB the thirdCeight o fiveAsixteenBeight-year-oldBten minutes现在学习的是第47页，共50页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 1040sA 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现在学习的是第48页，共50页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现在学习的是第49页，共50页Homework1.Grammar focus textbook(p30)exercise1-2 2、Workbook(p19)exercise4 50现在学习的是第50页，共50页