题目内容

把下列分数化成百分数.
7
8
=
87.5%
87.5%
    
9
10
=
90%
90%
    
 
4
25
=
16%
16%
       
3
40
=
7.5%
7.5%
13
20
=
65%
65%
     
1
3
8
=
137.5%
137.5%
    
 
5
7
71.4%
71.4%
     
10
9
111.1%
111.1%
分析:分数化百数,分母是100的分数,直接改写成百分数号即可,即去掉分母,添上百分号(%);一般分数化百分数,首先把分数化成小数,再把小数点向右移动两位,添上百分号(%)即可,如果不能化成有限小数,根据需要取近似值,一般百分号前保留一位小数.
解答:解:(1)
7
8
=0.875=87.5%;
(2)
9
10
=
90
100
=90%(或
9
10
=0.9=90%);
(3)
4
25
=0.16=16%(或
4
25
=
16
100
=16%);
(4)
3
40
=0.075=7.5%;
(5)
13
20
=0.65=65%;
(6)1
3
8
=1.375=137.5%;
(7)
5
7
≈0.714=71.4%;
(8)
10
9
≈1.111=111.1%.
故答案为:87.5%,90%,16%,7.5%,65%,137.5%,71.4%,111.1%.
点评:本题是考查分数化百分数,属于基础知识,必须掌握.
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