题目内容
把分数化成百分数
= | = | = | = | = | = |
= | = | = | = | = | = |
解:(1)=0.5=50%;
(2)=0.25=25%;
(3)=0.75=75%;
(4)=0.2=20%;
(5)=0.4=40%;
(6)=0.6=60%;
(7)=0.8=80%;
(8)=0.125=12.5%;
(9)=0.375=37.5%;
(10)=0.625=62.5%;
(11)=0.875=87.5%;
(12)=0.1=10%.
故答案为:50%,25%,75%,20%,40%,60%,80%,12.5%,37.5%,62.5%,87.5%,10%.
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.
点评:本题是考查分数化百分数,属于基础知识,必须掌握.
(2)=0.25=25%;
(3)=0.75=75%;
(4)=0.2=20%;
(5)=0.4=40%;
(6)=0.6=60%;
(7)=0.8=80%;
(8)=0.125=12.5%;
(9)=0.375=37.5%;
(10)=0.625=62.5%;
(11)=0.875=87.5%;
(12)=0.1=10%.
故答案为:50%,25%,75%,20%,40%,60%,80%,12.5%,37.5%,62.5%,87.5%,10%.
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.
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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