分数、小数、百分数%、+ – × / | 玄数

2015-05-16

SAT

Jerry, Will, Al all work at the same company. Jerry earns 80% of Will’s salary, and Will earns 75% of Al’s salary. What percent of Al’s salary is equal to Jerry’s salary?

A. 80%
B. 75%
C. 70%
D. 65%
E. 60%
Answer
E. Jerry, Will, Al都在同一家公司工作. Jerry获得的薪资是Will的80%, 而Will获得的薪资是Al的75%. Al的薪资的百分之几等于杰瑞的?

一、分数 Fraction

 

1

X
分子用 a(one),分母用X的序数词
1

2
a half 1

4
a quarter 1
——
100
a(one)hundredth

 


 

A

B
(A > 1)—— 分子A用基数词,分母B用序数词再 + s ,整数 and 分数
2

3
two thirds 4

5
four fifths 5 2

7
five and two sevens

二、小数 Decimal

点 —— point ,0可读 zero / nought / O :

0.1 —— zero point one

123.123 —— one hundred and twenty-three point one two three

三、 百分数 Percentage

% —— percent :

5% —— five percent

0.123 %—— zero point one two three percent

四、 + – × /

1. +  plus / add :2 + 10 = ? 2 + 10 = 12

How much is two plus ten?
Two plus ten is twelve.

2.  –  minus : 8 – 5 = ?  8 – 5 = 3

How much is eight minus five?
Eight minus five is three.

3.  ×  times / mutiplied by : 2 × 3 = ?  2 × 3 = 6

How much is two times three.?
Two times three is six.

4.  / divided by : 10 / 4 = ? 10 / 4 = 2.5

How much is ten divided by four?
Ten divided by four is two point five.

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练习

翻译: decimal fraction   十进制分数,小数
A fraction whose denominator is some power of 10, usually indicated by a dot (decimal point or point) written before the numerator: as 0.4 = 4/10; 0.126 = 126/1000.

分数、小数、百分数、+ – × /