英语加减乘除ppt课件

1、1;.2减减 minus 介词，作描画词讲时，是介词，作描画词讲时，是“负的的意思，相当负的的意思，相当negativesubtract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。 3乘乘 multiply动词动词 3 multiplied by 5 is 15. 三乘五等于十五。三乘五等于十五。 4除除 divide动词动词

2、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。 5加减乘除的名词方式如下加减乘除的名词方式如下1. addition 加法加法 2. subtraction减法减法 3 .multiplication乘法乘法 4 .division除法除法 62+3=5 Two plus three is (equals, is equal to) five. 5-3=2 Five minus three is equal to two. 32=6 Three times two is s

3、ix. Three by two are six. 93=3 Nine divided by three makes three. 7(1)年号的读法：年号的读法： 1979nineteen seventy-nine or nineteen hundred(and) seventy-nine; (2)号码、货币的读法：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： 13.91thirteen de

4、cimal(point)nineone;0.23=nought demical two three; 8Numbers cardinal numbers (基数词基数词) ordinal numbers (序数词序数词)9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的基数词普通在的基数词普通在39对应的基数词后加对应的基数词后加-teen构成，留意：构成，留意： thirteen fifteen eighteen3. 2090八个整十位数以后缀八个整

5、十位数以后缀-ty结尾。留意：结尾。留意： 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-seven105. 5. 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 “and衔接，在美国普通不用。衔接，在美国普通不用。 three hundred and five four hundred and forty-five three hundred and five f

6、our 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 fifty-three thousand, six hundred and forty-one30,045,310 thirty million and forty-five thousand, three hundred and ten3,333,333,333 117. hundred, thousand, million,billion前有确切数词时，前有确切数词时， 遵照遵照“两个无原那么，即无两个无原那么，即无 “s，无，无“of。 three hundre

7、d people nine million books8. 但但hundred, thousand, million, billion前无确切数词时，那么遵照前无确切数词时，那么遵照“两个有原那么，即有两个有原那么，即有 “s和和“of。 many thousands of trees millions of birdstens of thousands of soldiers three hundreds people three hundred of books129.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方式而且

8、只用名词的单数方式 an 8oo-hundred-word composition a five-week holiday a 20-meter-tall building10. 基数词可以表示年代、时辰、住所、房间、教室、号码等。基数词可以表示年代、时辰、住所、房间、教室、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13留意以下习惯表达方式：留意以下习

9、惯表达方式： half an hour half a kilotwo and a half kilos = two kilos and a halfone or two days = one day or two eighty meters long one thousand miles away five meters deep ( wide/ tall/ high/long) five meters in depth / width/ height/ length14序数词序数词(ordinal numbers)的构成及用法的构成及用法:基数词基数词 one, two , three 的序

10、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留意：留意：fifth eighth 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. “几十几的数及位数以上基数词的序数词几十几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 hundr

11、edthone thousandth four hundred and thirty-second155. 日期的表达普通用序数词日期的表达普通用序数词月日月日March 8(th) 读作：读作：March the eighth6.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，表示又一，再一连用，表示又一，再一再一次再一次a second time8. 在在世纪：世纪：in the twenty-first century in th

12、e nineteenth century16概数的表示法概数的表示法over/above/ more than + 数字数字 或：数字或：数字 odd (多以上多以上 over / more than two years (两年多两年多above twenty pounds (磅以上磅以上thirty odd years (30多年多年= more than 30 years2. below/ under/ less than +数字缺乏不到数字缺乏不到，以内以内 below six days under two hours less than 60 miles3. about/ nearly

13、/ 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 nine kilos or so more or less 20 meters =20 meters more or less17“每隔与每隔与“每逢的表示法：每逢的表示法：两种构造：两种构造： 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

14、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 bus runs every five minutes.One in every twenty students is to be chosen as the representative.18一些数学公式、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