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表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。
一、基数词的用法
(1) 基数词在句中主要用作主语、宾语、定语、表语、同位语，例如：
Thirty of them are Party members.（主语）
--- How many would you like？
--- Three ，please．（作宾语）
The nine boys are from Tianjing.（定语）
Six plus four is ten.（表语）
We four will go with you.（同位语）
(2) 表示一个具体数字时，hundred, thousand, million一律不用复数；在表示一个不确定数字时则用复数。例如：
Our country has a population of 1,300 million people.
There are three thousand students in our school.
After the war, thousands of people became homeless.
Maize is the most important food crop for millions of people in the world.
They arrived in twos and threes．
(3) 表示“……十”的数词的复数形式可用来表示人的岁数或年代，例如：
He is in his early thirties．
He died still in his forties．
This took place in 1930s．
(4) 表示时刻用基数词。例如：
We get up at six.
The workers begin work at eight.
表示“几点过几分”，用介词past,但须在半小时以内。例如：
ten past ten,
a quarter past nine,
half past twelve
表示“几点差几分”用介词to, 但分数须在半小时以上。例如：
twenty to nine,
five to eight,
a quarter to ten
表示“几点几分”还可直接用基数词。例如：
seven fifteen,
eleven thirty,
nine twenty
二、 序数词的用法
（1）序数词主要用作定语，前面要加定冠词，例如：
The first truck is carrying a foot baskets．
John lives on the fifteenth floor．
（2）序数词有时前面可加不定冠词来表示“再一”，“又一”这样的意思，例如：
We'll have to do it a second time．
Shall I ask him a third time？
When I sat down，a fourth man rose to speak．
（3）由几个序数词和基数词在拼写时不对应，很容易写错，应特别注意。它们是：one---first, two---second, three---third, five---fifth, eight---eighth, nine---ninth, twelve---twelfth。
（4）表示年，月，日时， 年用基数词表示，日用序数词表示。例如：
1949年十月一日读作: October (the) first, nineteen sixty
2004年九月十日读作：September (the) tenth, two thousand and four
（5）表示分数时，分子用基数词表示，分母用序数词表示。分子大于1时，分母加-s。例如：
three fourths,
one second,
two fifths
（6）序数词有时用缩写形式：
first→1st second→2nd
third→3rd fourth→4th
twenty-second→22nd
三、 数词的用法
1）倍数表示法
a. 主语+谓语+倍数（或分数）+ as + adj. + as
I have three times as many as you. 我有你三倍那么多。
b. 主语+谓语+倍数（分数）+ the size (amount，length…) of…
The earth is 49 times the size of the moon. 地球是月球的49倍。
c. 主语+谓语+倍数（分数）+ 形容词（副词）比较级+ than…
The grain output is 8 percent higher this year than that of last year.
今年比去年粮食产量增加8%。
d. 还可以用by+倍数，表示增加多少倍
The production of grain has been increased by four times this year.
今年粮食产量增加了4倍。
2）分数表示法
构成：基数词代表分子，序数词代表分母。分子大于1时，分子的序数词用单数，分母序数词用复数：
1/3 one-third ； 3/37 three and three-sevenths.
【实例解析】
1.About ________ students in our class can describe that place in English.
A. three-fifths B. three-fifth C. third-five D. third-fifths
答案：A。该题考查的是分数的表示法。分子用基数词表示，分母用序数词表示。分子大于1时，分母应加-s，因此应选A。
2.Nine _______ pounds a week? That’s very good.
A. hundred of B. hundreds of
C. hundreds D. hundred
答案：D。该题考查的是数词的用法。Nine hundred是一个具体的数量，这是数词不能用复数形式，后面也不能加of。所以应选D。
3. We often have sports after class, and I like to play _______ basketball.
A. a B. an C. the D. 不填
答案：D。该题考查的是冠词的用法。球类运动之前不加冠词，因此应选D。
4. This is _______ song I’ve told you about. Isn’t it _______ beautiful one?
A. the; the B. a; a C. the; a D. a; the
答案：C。该题考查的是冠词的用法。第一个空是特指，特指我给你说过的那首歌，第二个空是表示某一个类别。所以应选C。