数词的种类|佛山英语培训

文本来源：英语培训 首选爱德华国际英语

类别例词
数词基数词 one，twenty，hundred，thousand，million,three hundred and sixty-seven(367)
thirty-seven thousand six hundred and
fifty-five(37，655)
序数词 first，seventieth，hundredth，fifty-seventh
four thousand six hundred eighty-eighth
(第4，688)
分数 3/5（three fifths）
5/11(five elevenths)
(two and four ninths)
小数 12.54(twelve point five four)
0.332(zero point three three two)
0.05(zero point zero five)

基数词和序数词的用法

1. 基数词的用法

(1) 作定语。如：
There are only three boys in the class. 班上只有3名男生。
Ten people will come to the party. 十个人要来参加聚会。

(2) 作主语。如：
It is said that thirteen is an unlucky number. 据说13是个不吉利的数字。
Three of them will play football. 他们中有三人要去踢足球。

(3) 作宾语。如：
It is worth three hundred. 这件东西值300。
The city has a population of three million. 这个城市有三百万人口。

(4) 作表语。如：
I am eighteen. 我18岁。
Two and two is four. 二加二等于四。

(5) 作同位语。如：
Are you two coming? 你们俩来吗？
They ten will go abroad. 他们十个人将出国。

2. 序数词表示法

(1) 有时序数词前面可加不定冠词来表示“再一”，“又一”这样的意思。如：
We'll have to do it again. 我们得重做一次。
Shall I ask him a third time? 还要再问他一次吗？
When Nash sat down, a fourth man rose to speak.
纳什坐下后，第四个人又起来发言。

(2) 序数词的主要作用
作主语。如：
The first day of May is International Labour Day．五月一日是国际劳动节。
作表语。作表语时，序数词前的定冠词往往省去。如：
Lynd was second last year. 林德去年是第二。
作宾语。如：
He was among the forst to arrive. 他是首批到达的人员之一。
作定语。如：
May is the fifth month of the year. 五月是一年中的第五个月。
作同位语。如：
Who is the woman, the second in the second line? 在第二列第二个的那个妇女是谁？
但要注意：在很多情况下，我们可以用基数词代替序数词来表示顺序。如：
the second part = Part two （第二部分）
the first chapter = Chapter one （第一章）
the fourth section = Section four （第四节）

1. 小数表示法

(1) 小数的读法
　　小数点左边的数通常按基数词读，若为三位以上的数，也可按编码式读法读出，即将数字单个读出；小数点右边的数通常按编码式读法单个读出。如：
6.86 six point eight six
14.15 fourteen point one five
345.456 three four five point four five six
或three hundred and forty－five point four five six

(2) 小数中“0”的读法
“0”在小数中通常读作nought（英）或zero（美），也可读作字母o。如：
0.08 （nought）point nought eight 或（zero）point zero eight
9.07 nine point o seven

2. 百分数表示法

百分数中的百分号％读作percent。如：
6% 读作 six percent
0.6% 读作（nought） point six percent
500% 读作 five hundred percent

3. 倍数表示法

倍数表示方法很多，如：
This room is four times as big as mine. 这个房间是我房间的四倍。
This room is three times larger than that one. 这个房间比那个房间大两倍。
The output of coal has doubled. 煤的产量增加了一倍。
My aunt is as old again as I am. 我姑姑年龄比我大一倍。
Productivity is increased three fold. 生产效率提高了两倍。
The volume of the Sun is about 1,300,000 times that of the Earth.
太阳的体积约为地球的1300000倍。

4. 加减乘除式的读法

6+5＝11 Six plus five is eleven 或 Six and five is eleven.
11-6＝5 Eleven minus six is five. 或 Six from eleven is five.
4×5＝20 Four multiplied by five is twenty.或 Four times five is twenty.
20÷4＝5 Twenty divided by four is five. 或 Four into twenty goes five.
15:5＝3 The ratio of fifteen to five is three.
32 Three squared is nine.
23 Two cubed is eight.
24 The fourth power of two is sixteen.
X^(1/2)=Y The square root of X is Y.
X^(1/3)=Y The cubic root of X is Y.
a ＞ b a is more than b.
a ＜ b a is less than b.
a ≈ b a approximately equals to b.
a ≠ b a is not equal to b.

5. 分数表示法

(1) 较小分数的一般读写方法。如：

1/3 one-third 2/3 two-thirds 3/5 three-fifths

(2) 较复杂分数的简明读写方法。如

22/9 twenty-two over nine
a/b a over b 或 a divided by b 43/97 forty-three over ninety-seven

(3) 整数与分数之间须用and连接。如：

four and a half nine and two fifths

(4) 分数用作前置定语时，分母要用单数形式。注意下列写法与读法。如：

a one-third mile　1/3英里 a three-quarter majority　3/4的多数

文本来源：商务英语培训 首选爱德华国际英语