（一）基数词在英语中表示数目的词称为基数词。

1.基数词的构成（1）1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty（2）21-99 先说“几十”，再说“几”，中间加连字符。

23→twenty-three,34→thirty-four,45→forty—five,56→fift y-six,67→sixty-seven,78→seventy-eig ht,89→eighty-nine,91→ninety-one（3）101—999先说“几百”，再加and,再加末两位数或末位数；586→five hundred and eighty-six,803→eight hundred and three（4）l,000以上,先从右往左数，每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为million,第三个“,”前为billion（美式）或thousand ,million（英式）,然后一节一节地表示。

1,001→one thousand and one9,785→nine thousand, seven hundred and eighty-five18,423→eighteen thousand,four hundred and twenty-three6,260,309→six million two hundred and sixty thousand three hundred and nine750,000,000,000→seven hun dred and fifty, billion（美式）seven hundred and fifty thousand million（英式）4.基数词的用法:1.表年代。

年份通常分成两部分说。

例如：1626 年sixteen twenty-six 2000 年twenty hundred／two thousand 1902年nineteen o（或者and）two／nineteen hundred and two 2003→two thousand and three2. 表时间①整点5：00 five／five o'clock②半小时以内（包括半小时）eleven thirty（钟点＋分钟）half past eleven（分钟＋past＋钟点）eight twenty twenty past eight③超过半小时（到下一个钟点）one fifty-eight（钟点＋分钟）two to two（分钟＋to＋下一个钟点）注意：半小时以内的表达用介词past，表达“几点过几分”之意；超过半小时要用介词to，表示“到下一个钟点还有几分”（即“几点差几分”）之意。

④一刻（15分钟）常用a quarter表示。

如：a quarter to seven六点四十五分（七点差一刻）a．m．表上午，p．m．表下午。

例如：7：20a．m．早7点20分。

3．表电话、车牌等号码碰到号码应把数字分开一个个说。

“o”读成［u］，英国人常把相同的两个数如22，读作double two。

例如：045-4166386o four five-four one double six three eight six4．表长、宽、高、深，货币等计量①货币的读写。

7．35seven dollars thirty-five cents七美元三十五美分￡3．75three pounds seventy-five pence三英镑七十五便士￥5．24 five yuan twenty-four fen五元二角四分a five-pound note一张五英镑的钞票注意：dollar，pound，cent有复数变化，而人民币的yuan，fen无此变化。

②年龄、长、宽等计量的表达法。

He is sixteen（years old），and he's one and a half metres tall．5．表编号，即在特定的一些用法中表顺序。

Lesson 9＝Lesson Nine ＝The Ninth Lesson第九课（注意大小写变化）Page 51＝Page Fifty-one第五十一页Room 203＝Room two o three 203房间the No．17 bus ＝the number seventeen bus第十七路公共汽车6. 数的计算（初中仅见加法表达）“How much／What is two and four？”“Two and four is six．”7．温度及比赛分数的读写①温度The temperature will be 2—9．（2—9读写作two to nine）②比赛分数At the end of the first half we were winning 2：1．（2：1读写作two to one）8．数字的具体表达与约略表达①具体表达ten（十）→ten books（十本书）→ten of the books（其中的十本书）②约略表达tens（若干个“十”）→tens of the books（数十本书）。

依此类推：hundreds（若干个“百”）→hundreds of．．．（数以百计的……，成百上千的……）thousands（若干个“千”）→thousands of．．．（数以千计的……，成千上万的……）。

例如：There are over seven hundred students on the ground．操场上有七百多名学生。

There are（several）hundreds of students on the ground．操场上有几百名学生。

应注意hundreds of．．．等前可用some，several，many，tens of．．．等词语修饰。

9. 基数词的其它表达①表“一次、两次”英语用once和twice。

“三次”用three times，依此类推。

②注意下列表达in one's teens在十几岁时；in one's twenties在二十多岁时；in the nineties在九十年代；one or two hours一两个小时；two hours and a half ＝two and a half hours两个半小时10. 小数的表示方法：小数的表示法和汉语中小数表示法一样，小数点后的数字是“见几读几”，点用point 表示。

27.832 twenty-seven point eight three two3) 百分数 40% ---- forty percent 0.3%---- (zero) point three percent11.表示年代或岁数时，用逢十的基数词的复数形式in the 1960s 二十世纪六十年代in his fifties 在他五十多岁的时候in his early twenties 在他二十岁出头的时候表示十几岁时要用in one’s teens一．读出下列数字。

1). 5/15/50/552) 13/30/333) 14/40/445102 345 1,658 83,890 6,783,310_____________________________________________________________________________________________________________________________________ 4).1:05 _______________ 8:15 _______________3:30_______________9:32 _______________10:45 _______________ 1:58 _______________5). 1991 1874 20006) 在20世纪50年代_______________在14世纪80年代__________________ 7）在他60几岁时_________________ 在我40几岁时_____________________8) “一次”___________ “两次”____________ “三次以上” _______________9)1).Wang Qing is a __________________(一个五岁大的男孩)boy.1o).We can see __________________(数千颗星星)stars at night if it doesn‘t rain. 11). More than __________________(超过一万)people took part in the Walk For Millions.( 参加了百万行)二、选择填空1.Two ______________ died of cold last winter.A.hundreds old peopleB. hundreds old peoplesC. hundred old peopleD. hundred old peoples2.Henry is __________ tallest in their class.A.threeB. the threeC. thirdD. the third3.When springs comes, __________ trees are planted in our city.lions ofB. a million ofC. two millionsD. million of4.John began to learn Japanese by himself in _________.A.the fiftyB. the fiftiesC. his fiftyD. his fifties5.--- What’s the English for 12:30? --- It’s __________.A.twelve and thirtyB. one to thirtyC. twelve thirtyD. an half past twelve6.In ____________ Marx(马克思) began to learn Russian(俄语)。

A. a 1870B. the 1870C. the 1870sD. his 18707. There are about two ____________ students in the school.A. thousandB. thousandsC. thousand ofD. thousands of8. The _________ question is much more difficult than this one.A. sixthB. sixC. sixteenD. sixty9. In our city __________ people have moved into their new houses.A. thousandB. thousandsC. thousands ofD. two thousands10. In our city __________ people have moved into their new houses.A. thousandB. thousandsC. thousands ofD. two thousands11. She is _______, but she looks young.A. in her fiftyB. at her fiftyC. in her fiftiesD. at her fifties12. Our summer holiday is coming. Two ________ the students in our school will go to the beach.A. hundredB. hundredsC. hundred ofD. hundreds of13. ------ How many people will come to Beijing for the 2008 Olympic Games?------ It’s hard to say. _________, I think.A. Millions ofB. MillionC. Two million ofD. Two millions of14..I have_________ orange. You may drink it.A. a littleB. a fewC. fewD. little15. Jim often gets up at _______.A. a quarter past sixB. a quarter pass sixC. six a quarterD. six fifteenth 16．There are _______ days in a year．（'99河北）A．three hundreds sixty-five B．three hundreds and sixty five C．three hundred and sixty-five D．three hundred and sixty five 17．Six million，six hundred and sixty-six thousand，six hundred and sixty-six is _______ ．A．6，666，666 B．666，666，666 C．6，600，666 D．60，600，66618．There are _______ students in our school．A．eight hundred and fifty four B．eight hundred and fifty-fourC．eight hundreds and fifty-four D．eight hundreds and fifty four19．The beautiful hotel is about _______ years old．A．hundred of B．a hundred C．a hundred of D．hundreds20．We are going to learn _______ tomorrow．A．Lesson Tenth B．Lesson Ten C．Tenth Lesson D．The Lesson Ten。