题目内容
把下列分数化成百分数.
87.5% 87.5% |
90% 90% |
16% 16% | ||||||
7.5% 7.5% |
65% 65% |
1
137.5% 137.5% | ||||||
71.4% 71.4% |
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)
=0.875=87.5%;
(2)
=
=90%(或
=0.9=90%);
(3)
=0.16=16%(或
=
=16%);
(4)
=0.075=7.5%;
(5)
=0.65=65%;
(6)1
=1.375=137.5%;
(7)
≈0.714=71.4%;
(8)
≈1.111=111.1%.
故答案为:87.5%,90%,16%,7.5%,65%,137.5%,71.4%,111.1%.
7 |
8 |
(2)
9 |
10 |
90 |
100 |
9 |
10 |
(3)
4 |
25 |
4 |
25 |
16 |
100 |
(4)
3 |
40 |
(5)
13 |
20 |
(6)1
3 |
8 |
(7)
5 |
7 |
(8)
10 |
9 |
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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