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)
(1)1-20：one，two，three，four，five，six，seven，eight，nine，ten，eleven，twelve，thirteen，fourteen，fifteen， sixteen，seventeen，eighteen，nineteen，twenty
2.基数词变序数词的方法：
(1)一般在基数词后加th
eg.four→fourth，thirteen→thirteenth
(2)不规则变化
one→first，two→second，three→third，five→fifth，eight→eighth，nine→ninth，twelve--~twelfth
(3)以y结尾的十位整数，变y为ie再加th
twenty→twentieth， forty→fortieth，ninety→ninetieth
(4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。
twenty-first，two hundred and forty-fifth
口诀：
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。
3.数词的应用：
A、时间：
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
www.kuaixue5.comB、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、表约数：
表不确定的数字时，数词用复数。
若带名词，再加of
如：hundreds of(数百，成百上千的)，thousands of(数干，成千上万的)，millions of(数百万的)
G、数学运算的表达
eg.3+5=8 Three plus/and five is eight.
9-2=7 Nine minus two is seven.
6x5=30 Five times six is thirty
8÷2=4 Eight divided by two is four.
www.kuaixue5.com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
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