1—100的基数词、序数词的拼写
英语中基数词变为序数词时，一般在基数词后加词尾-th，但有几个词变化特殊，只要记住下面这个口诀。
一、二、三，单独记；八去t，九除e，五、十二中f变ve，再加词尾-th；整十基数变序数，先把y尾改ie；要是遇到两位数，十位基数个位序。
解析口诀：one→first， two→second， three→third这三个词变化特殊，要单独记；eight→eighth， nine→ninth， 八去t，九去e后再加-th； five→fifth， twelve→twelfth，五、十二把ve换成f再加-th；twenty→twentieth， thirty→thirtieth... 整十先把词尾y改为ie再加-th。两位数时则十位数用基数词，个位数用序数词，如：twenty-first。
英语基数词与序数词的记忆方法
一、基数词
下面把100以内的基数词分为四类。
1、第一类：
one 一 two 二 three 三 four 四 five 五 six 六 seven 七 eight 八 nine 九 ten 十 eleven 十一 twelve 十二
这一类共计十二个单词，在结构上与其他的基数词相比较是特殊的，就象不规则的动词一样，要求逐个的硬背下来，这对学好其他的基数词和序数词都是及其重要的。
2、第二类：
thirteen 十三 fourteen 十四 fifteen 十五 sixteen 十六 seventeen 十七 eighteen 十八 nineteen 十九
这一类基数词共有七个。它们在结构上有两个特点：一是在发音方面都有两个重音；二是在拼法上都有后缀－teen。除了thirteen和fifteen之外，都是纯粹地在另一个基数词的后面加上后缀－teen。但要注意eighteen的拼法，eight本身有t字母，因此只加－een。
3、第三类：
twenty 二十 thirty 三十 forty 四十 fifty 五十 sixty 六十 seventy 七十 eighty 八十 ninety 九十
这类基数词共有八个。都是十位的整数，均以后缀－ty结尾。其中sixty、seventy、eighty、ninety基本上是在相应的基数词后面加上后缀－ty。但要注意eighty的拼法，eight本身有t字母，因此只加－y。
4、第四类：
这一类和很简单，可以看成是一种合成词。其结构方式是：用十位整数加上个位整数，其间用连字符号“－”连接，表示“几十几”。这类基数词的变化都是规则的。如：
twenty-one 二十一 forty-six 四十六 seventy-eight 七十八 ninety-five 九十五
二、序数词
下面把1－99的序数词也分为四个类。
1、第一类 :
first (1st) 第一 second (2nd) 第二 third (3rd) 第三
（在括号里的是缩写形式，均在阿拉伯数字后面加上相应序数词的最后两个字母构成，以下各类与此相同。）这类序数词只有三个，在整个序数词里面是特殊的，就和第一类基数词一样，需要逐个地硬记下来。
2、第二类：
fourth (4th) 第四 fifth (5th) 第五 sixth (6th) 第六 seventh (7th) 第七 eighth (8th) 第八 ninth (9th) 第九 tenth (10th) 第十 eleventh (11th) 第十一 twelfth (12th) 第十二 thirteenth (13th) 第十三 fourteenth (14th) 第十四 fifteenth (15th) 第十五 sixteenth (16th) 第十六 seventeenth (17th) 第十七 eighteenth (18th) 第十八 nineteenth (19th) 第十九
这一类序数词共有十六个。均在相应的基数词后面加上后缀－th构成。要注意其中fifth、eighth、ninth、twelth四个词的拼法。
3、第三类：
twentieth (20th) 第二十 thirtieth (30th) 第三十 fortieth (40th) 第四十 fiftieth (50th) 第五十
sixtieth (60th) 第六十 seventieth (70th) 第七十 eightieth (80th) 第八十 ninetieth (90th) 第九十
这一类全是十位整数的序数词，共八个。它们的构成方法是：先将相应的十位整数的基数词词尾－ty中的y改成i，然后在加上后缀－eth。
4、第四类：
thirty-first (31th) 第三十一 sixty-second (62nd) 第六十二 eighty-seventh (87th) 第八十七
ninety-eighth (98th) 第九十八
这类表示“第几十几”的序数词，跟表示“几十几”的基数词一样简单。在构成方法上均由基数词“几十几”变化而来，十位数不变，仅把个位上的基数词变成序数词就行了。
数词主要掌握基数词和序数词的用法，也包括一些生活中常用的表示法，如：英语年月日的书写顺序、数字的读法、分数，百分数的表示法、年代、世纪、班级等等。
数词专项练习（一）
一、写出下列数字的序数词：
1，2，3，5，9，12，20，34
二、写出1—12月份：
三、选择填空：
1.Could you tell us how to read the number 18,306,211?
A.eighteen million, three hundred and six thousands, two hundred eleven
B.eighteen million, three hundred and six thousand, two hundred and eleven
C.eighteen millions, three hundred six thousands, two hundreds and eleven
D.eighteen thousand, three hundred and six, two hundred eleven
2.Shakespeare was born in ______。
A.1660s B.1660’s C.the 1660s D.the 1660’s
3.Bill said they were going to have _____ holiday。
A.a two-weeks’ B.a two-week C.two weeks’ D.two weeks
4.Over ______ of the articles on education have been published。
A.two thirds B.two third C.seconds three D.seconds third
5.My father left home at about __。
A.six thirty B.thirty six C.thirty to six D.six past thirty
6.We all think that the ______ century will bring us more hopes。
A.twenty-first B.twentieth-first C.twenty-one D.twentieth-one
7.——What’s your room number?
——It’s ______。
A.The 601 Room B.601 Room C.The Room 601 D.Room 601
8.______ the students usually surf on the Internet and get information。
A.60 percents of B.60 percent C.60 percent of D.60 percents
9.Several _______ new books were sold out last week。
A.of thousand B.thousands C.thousand of D.thousand
10.Which is right?
A.2009, June 25 B.25th June, 2009 C.June 25, 2009 D.June 25st, 2009
11.Tomorrow is my ________ birthday。
A.sixteen B.sixteenth C.the sixteenth D.the sixteen
12.We have stayed at this school for _______ 。
Which following choice is wrong?
A.two and a half years B.two years and a half C.two years and half a year D.both A and B
四、写出下列正确形式：
1。九年级2班 2。第7排 3.515房间 4。在二层楼
5.2009年2月14日 6.50公里长的大桥 7。在第46页 8。第一中学
9。四分之三 10.49
五、 写出下列基数词和序数词。
1________ ________ 2________ _______ 3________ ________ 5_______ _______
9________ ________ 11________ ___ __12________ ________ 13________ ________
20________ ________ 71________ ________ 22________ ________ 83________ ________
28________ ________ 34________ ________ 36________ ＿＿＿＿ 47________ ________
六、 英汉互译。
第五单元_____ Lesson Eight___________第59中学___________ 五年级四班____________Bus No.4___________ 7:07___________7+8=15_________1994年_____________352____________ one o eight___________Team Seven________ 第三行____________第5小学__________ five little mice________第六号房间________
七、 用括号内所给数词的正确形式填空。
1. We are in Class________（3）.
2. We have________（12）months of the year. December is the _____________（12）one.
3. This is my________（1）bag. 4. My birthday is Dec.________（21）.
5. I have________（3）books. I like my________（3） book.
八、 选择题。
1. My grandmother is_____ old.
A. seventieth B. seventy year C. seventy years D. seventies
2.________people visit this museum every day.
A. Hundred B. Hundreds C. hundred of D. Hundreds of
3. There are two ________people in the meeting room.
A. hundred B. hundreds C. hundreds of D. hundred of
4. We can say the number 78,645 in English like this________.
A. seventy-eight thousand and six hundred and forty-five
B. seventy-eight thousand six hundred and forty five
C. seventy-eight thousand six hundred and forty-five
D. seventy eight thousand six hundred and forty-five
5. Monday is the second day, and________.
A. Tuesday is the fourth B. Thursday is fifth
C. the second day is Tuesday D. the second day is Thursday
6.“The year 1999”should be read（应该读作）“The year _____.”
A. nineteen and ninety-nine B. nineteen ninety-nine
C. one thousand nine hundred ninety-nine D. nineteen hundred and ninety-nine
7. There are ________months in a year. December is the ________month of the year.
A. twelve; twelve B. twelve; twelfth C. twelfth; twelve D. twelve; twelveth
8. What’s the date today? It is ________.
A. Friday B. time to go C. cloudy D. June 4th
9. What is five and eight?
A. Twelve B. Thirteen C. Fourteen D. Fifteen
10. What _________is Lily in? She is in________.
A. Row; row five B. Row; Row Five C. row; Row Five D. row; row Five
人教PEP版小学六年级英语基数词序数词练习题
I. Choose the best answer
( )1. Please turn to ______.
A. Page 11 B. the 11 st page C. page 11 D. page the 11 th
( )2. At night we can see ______ stars in the sky.
A. thousands and thousands of B. thousand and thousands of
C. a thousand and thousands D. thousand and thousand
( )3. There are some _____ in our classroom.
A. hundred of books B. the hundreds of books C. hundreds of books D. hundred of book
( )4. I have been to the village ________.
A. a hundred time B. hundred times C. hundreds of times D. hundred of times
( )5. There are ____ students in our school.
A. four—hundred and forty—five B. four hundred and forty—five
C. four hundreds and forty—five D. four hundred and forty five
( )6. The teacher told me to go over _____ lessons.
A. thirst three B. the three first C. three the first D. the first three
( )7. May is ____ of a year.
A. the fifth months B. the fifth month C. the five months D. the five month
( )8. We live in ______.
A. the twenty-first century B. the century twenty-one C. century twenty-one D. the century twenty-first
( )9. He said he was going to be free in _______.
A. one and a half hour B. one hour and half C. one and half hours D. an hour and a half
( )10. ---How many English books are there on the table?
---There is only _____English book on it.
A. a B. an C. one D. the
( )11. Mr Smith stayed in _____ last night.
A. Room 403 B. the Room 403 C. the 403 room D. 403 the room
( )12. The road is _________.
A. two thousand and five hundred metres long B. two thousands metres long
C. long one thousand five hundred metre D. a thousand and five hundreds metres long
( )13. He joined the army on ______ of May 1980.
A. 1 st B. the 1 C. first D. the first
( )14. Is Sunday the ____ day of the week?
A. a B. one C. once D. first
( )15. March the _____ is Women’s Day.
A. eighth B. ninth C. tenth D. eight
( )16. September is the _____month of the year.
A. nineth B. ninth C. nine D. the twelveth
( )17. December the ____ is Christmas.
A. twenty-five B. twenty-fifth C. twentieth-five D. twenty-five
( )18. Another way of saying Lesson 12 is __________.
A. Lesson ten-two B. Lesson Ten-second C. the Twelfth Lesson D. Twelfth lesson
II. Complete the sentences according to the numerals: (用past或 to的句型)
1.What time is it ? (8:30) It’s ___________________________.
2. What is it ? (9:15) It’s ___________________________.
3. What time is it ? (7;45) It’s ___________________________.
4. What was the date ? (1893年1月226日) It ______________________________________.
III. Translate the following into English:
1. 电话号码8485308 _____________________ 2. 第六十四中学 ___________________
3. 成千上万的儿童 _____________________ 4. 两个月半 _______________________
5. 45路公共汽车 ______________________ 6. 三分之一 _______________________
7. 五分之四 ________________________ 8. 第501房间 _____________________
9. 第二层 _________________________ 10. 第三次 ______________________
11. 第五册 _______________________ 12. 两周半 ____________________
13. 他每天早上总是第一个到校。_____________________________________________
14. 第三天早上玛丽没有迟到。_______________________________________________
15. 这本书我昨晚读了20页。______________________________________________.
16. 最近的医院离他们学校约4—5公里。____________________________________
17. 在二十世纪三十年代 ___________________ 18. 中华路21号__________________
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