《英语加减乘除》优秀课件.ppt

1、英语加减乘除优秀课件加加plu减减minus,s 减减 minus（介词，作形容词讲时，是（介词，作形容词讲时，是“负的负的”的意思，相当的意思，相当negative）subtract（动词，常与（动词，常与from连用）减去；扣除连用）减去；扣除 12 minus 7 leaves 5.十二减去七剩五。十二减去七剩五。If you subtract 3 from 5,you get 2.The temperature was minus 20 degrees.温度是零下温度是零下20度。度。乘乘mul 乘乘 multiply（动词）（动词）3 multiplied by 5 is 15.三乘

2、五等于十五。三乘五等于十五。除除di 除除 divide（动词）（动词）15 divided by 3 is 5.3 除除15等于等于5。Three will not divide into eleven.三除不尽十一。三除不尽十一。加减乘除的名词形式如下加减乘除的名词形式如下 1.addition 加法加法 2.subtraction减法减法 3.multiplication乘法乘法 4.division除法除法 2+3=5 Two plus three is(equals,is equal to)five.5-3=2 Five minus three is equal to two.32=

3、6 Three times two is six.Three by two are six.93=3 Nine divided by three makes three.(1)年号的读法：年号的读法：1979nineteen seventy-nine or nineteen hundred(and)seventy-nine;(2)电话号码、货币的读法：电话号码、货币的读法：1023one o two three;1227one double two(or two two)seven;.25four dollars(and)twenty-five(cents);(3)小数点的读法：小数点的读法：

4、13.91thirteen decimal(point)nineone;0.23=nought demical two three;Numbers cardinal numbers (基数词基数词)ordinal numbers (序数词序数词)基数词基数词(cardinal numbers)的构成及用法的构成及用法:1.112的基数词是独立单词的基数词是独立单词,无规律可循。无规律可循。eleven twelve2.1319的基数词一般在的基数词一般在39对应的基数词后加对应的基数词后加-teen构成，注意：构成，注意：thirteen fifteen eighteen3.2090八个整十位

5、数以后缀八个整十位数以后缀-ty结尾。注意：结尾。注意：twenty(20)thirty(30)forty(40)eighty(80)4.“几十几几十几“的基数词由十位数和个位数中间加的基数词由十位数和个位数中间加 连字符连字符 “-”构成：构成：twenty-nine ninety-seven5.百位数和十位数之间，在英国英语要用百位数和十位数之间，在英国英语要用 “and”连接，连接，在美国一般不用。在美国一般不用。three hundred and five four hundred and forty-five 6.英语中英语中“万万”及以上的表示法：及以上的表示法：53,461 fi

6、fty-three thousand,six hundred and forty-one30,045,310 thirty million and forty-five thousand,three hundred and ten3,333,333,333 7.hundred,thousand,million,billion前有确切数词时，前有确切数词时，遵循遵循“两个无两个无”原则，即无原则，即无“s”，无，无“of”。three hundred people nine million books8.但但hundred,thousand,million,billion前无确切数词前无确切数词

7、时，则遵循时，则遵循“两个有两个有”原则，即有原则，即有“s”和和“of”。many thousands of trees millions of birdstens of thousands of soldiers three hundreds people three hundred of books9.基数词常与名词连用构成复合定语，中间要用连字符，基数词常与名词连用构成复合定语，中间要用连字符，而且只用名词的单数形式而且只用名词的单数形式 an 8oo-hundred-word composition a five-week holiday a 20-meter-tall buildi

8、ng10.基数词可以表示年代、时刻、住所、房间、教室、基数词可以表示年代、时刻、住所、房间、教室、电话号码等。电话号码等。in 1980s (1980s)=in nineteen eightiesPage three Room 403 at seven thirty in 1991(in nineteen ninety-one)in ones fifties(在某人多岁的时候）在某人多岁的时候）注意下列习惯表达方式：注意下列习惯表达方式：half an hour half a kilotwo and a half kilos=two kilos and a halfone or two day

9、s =one day or two eighty meters long one thousand miles away five meters deep(wide/tall/high/long)five meters in depth/width/height/length序数词序数词(ordinal numbers)的构成及用法的构成及用法:1.基数词基数词 one,two,three 的序数词分别为的序数词分别为:first,second,third (1st 2nd 3rd)2.从第四到第十九的序数词在基数词后加从第四到第十九的序数词在基数词后加“-th”注意：注意：fifth eig

10、hth ninth twelfth3.十位整数基数词的序数词需将词尾的十位整数基数词的序数词需将词尾的“y”改为改为“i”，再加再加“eth”构成构成 twenty twentieth forty fortieth ninety ninetieth4.“几十几几十几”的数及位数以上基数词的序数词的数及位数以上基数词的序数词只将个位变成序数词即可只将个位变成序数词即可one hundredthone thousandth four hundred and thirty-second5.日期的表达一般用序数词日期的表达一般用序数词月日月日March 8(th)读作：读作：March the eig

11、hth6.用于最高级前表示用于最高级前表示“第二、第三第二、第三“the second most useful the third largest city7.second,third 等与等与“a“连用，表示连用，表示”又一，再又一，再一一”再一次再一次a second time8.在在世纪：世纪：in the twenty-first century in the nineteenth century概数的表示法概数的表示法1.over/above/more than+数字数字 或：或：数字数字 odd (多以上）多以上）over/more than two years(两年多）两年多）a

12、bove twenty pounds(磅以上）磅以上）thirty odd years(30多年）多年）=more than 30 years2.below/under/less than+数字数字（不足不到（不足不到，以内）以内）below six days under two hours less than 60 miles3.about/nearly/some/toward(s)/more or less+数字数字数字数字or so/more or less(大约近大约近，上下左右）上下左右）about 90 yards nearly one tenth some fifty feet

13、nine kilos or so more or less 20 meters=20 meters more or less“每隔每隔”与与“每逢每逢”的表示法：的表示法：两种结构：两种结构：every+基数词基数词 复数名词复数名词 every+序数词单数名词序数词单数名词 every four days every fourth day每四天（每隔三天）每四天（每隔三天）every three linesevery third line每三行（每隔二行）每三行（每隔二行）每隔一天：每隔一天：every other dayevery two daysevery second dayThe b

14、us runs every five minutes.One in every twenty students is to be chosen as the representative.一些数学公式、小数和分数的表示法：一些数学公式、小数和分数的表示法：7X3=21 Seven times/multiplied by three is twenty-one.93=3 Nine divided by three is 3.3.5 three point five a(one)half 1/3 one third a/one fourth a/one quarter4/5 four fifths 12/23 twelve twenty-thirds英、美楼层的不同表示法：英、美楼层的不同表示法：