数词分为基数词和序数词。用于表示事物数目的词称为基数词，表示事物顺序的词称为序数词。
1.基数词(1000以内的基数词的读法)
365—three  hundred  and  sixty-five
505—five  hundred  and  five
2.基数词变序数词的方法：
    基变序，有规律；词尾要加th。
    一二三，特殊记；词尾分别tdd。
    八去t  ，九去e  ；ve则以f替。
    ty  则变作  ti        ;  后面还有一个e。
    要是遇到几十几；只将个位变成序。
eg.  one—first    two—second    three—third  
eight—eighth    nine—ninth    twelve—twelfth
twenty—twentieth    
twenty-one  –-twenty-first
3.数词的应用：
A、时刻表达法：
a.  整点：基数词  +  o’clock
eg.  It’s  eight  o’clock  now.
b.  几点几分：
  1．直接表达法：先小时后分
  eg.  3:25      three  twenty-five
  2.间接表达法：先分后小时
1)(<30分钟)用past  ：分钟past  小时  
eg.  3:25    twenty-five  (minutes)  past  three
2)  (>30分钟)用to：(60-分钟数)  to  (小时数+1)
  eg.  3:35  twenty-five  (minutes)  to  four
3)  30分钟  =  half    15分钟  =  a  quarter
eg.  3:30    three  thirty  =  half  past  three
      3:15    three  fifteen  =  a  quarter  past  three.
      3:45    three  forty-five  =  a  quarter  to  four
B、日期表达法：月日，年（或日月年）
1949年10月1日  :    
October1st  ,  nineteen  forty-nine
=the  first  of  October,  nineteen  forty-nine
2000年:      the  year  two  thousand
=twenty  hundred
2001年:      twenty  o  one
3月1日:    March  the  first  =  the  first  of  March
C、表编号：
第207房间：Room  207
第五课：  Lesson  5  =  the  fifth  lesson
D、序数词与不定冠词(a;  an)连用表“又一；再一”
eg.  You’ve  done  it  three  times.  Why  not  try  a  fourth  time?
E、分数的表达：分子（基数）、分母（序数）
eg.  one  third  三分之一  two  thirds  三分之二
注意：1.分子超过1时，分母加s
2.含分数的短语作主语由分数后的词决定谓语
eg.1)One  third  of  the  students  are  girls.
    2)One  third  of  the  milk  is  mine.
3.分数的特殊形式
1)one  third  =  a  third
2)one  fourth  =  a  quarter  
    three  fourths  =  three  quarters
3)one  second  =  a  half
F、一些数词的复数  +  of表约数：
hundreds  of  ;  thousands  of  ;  millions  of
练        习
(    )1.If  you  go  out  at  night,  you’ll  be  able  to  see  ____  starts.
A.  thousands  of            B.  thousand  of
C.  nine  thousands  of    D.  thousands
(    )2.Monday  is  ___  day  of  the  week.
A.  first                        B.  the  first  
C.  the  second              D.  second
(    )3.You’ve  done  it  twice.  Why  not  try  ____  time?  
A.  third    B.  the  third    C.  a  third    D.  once
(    )4.Which  is  the____  month?  It’s  September.
A.  nine    B.  nineth      C.  ninth    D.  ninety
(    )5.December  is  ___  of  the  year.
A.  the  twelfth  months    B.  the  twelfth  month
C.  the  twelveth  months  D.  twelve  months
(    )6.There  are  ___  floors  in  the  building  and  he  lives  on  the  ____  floor.
A.  eighteen,  fifteen    B.  eighteenth,  fifteenth
C.  eighteen,  fiveteen  D.  eighteen,  fifteenth
(    )7.I  was  born  ___,  1982.
A.  on  June  2rd          B.  in  June  2nd
C.  on  June  two          D.  on  June  2
(    )8.It’s  ____  from  our  home  to  the  zoo.
A.  two  and  a  half  hours’  walk
B.  a  half  and  two  hours  walk
C.  two  hours  and  a  half  hour’s  walk
D.  two  and  a  half  hour’s  walk
(    )9.What  time  is  it  now?  It’s  ___  to  six.
A.  quarter  B.  a  quarter  C.  quarto    C.  a  quarto
(    )10.Will  you  be  back  in  ____  ?
A.  one  or  two  minutes  B.  one  minute  or  two
C.  two  minutes  or  one  D.  two  or  one  minute
(    )11.Mary’s  uncle  went  to  France  ____.
A.  in  his  thirties            B.  on  his  thirties
C.  at  his  thirties            D.  about  his  thirties
(    )12.The  headmaster  wrote  a  ___  report.
A.  two  thousand  words  B.two-thousand-words
C.  two-thousand  words  D.  two-thousand-word
(    )13.____of  the  apples  in  the  fruit  bowl  are  soft  and  sweet.
A.  Two-third                  B.  Second-third
C.  Two-thirds                  D.  Second-thirds
(    )14.We  have  learned  about  ____  these  days.
A.  several  hundreds  English  words
B.  hundreds  of  English  words
C.  hundred  of  English  words
D.  several  hundred  English  word
(    )15.A  UN  report  says  that  the  word  population  will  pass  six  billion  by  the  end  of  ____  century.
A.  twentieth                  B.  twenty
C.  the  twentieth            D.  the  twentyth

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