13 倍数/分数/小数/百分数：名词的远房亲戚们（2）

一、倍数

1. 写法：最低从两倍开始。

twice (两倍), three times (三倍)...

注意：三倍以上全部记作基数词 + times 。

2. 常见用法

This room is twice as large as that one.

This room is twice larger than that one.

This room is twice the size of that one.

这个房间是那个房间的两倍大。

3. 其它常见写法

double (两倍，翻一翻), triple (三倍), quadruple (四倍)

二、分数

分子基数词，分母序数词；分子大于一，分母变复数。常见表达举例如下：

1/3 one third

2/3 two thirds

1/4 one quarter

3/4 three quarters

5又1/3 five and one third

5又1/2 five and a half

三、小数

1.25 one point two five

0.56 zero point five six

四、百分数（基数词+percent ）

5% five percent