把下面的分數(shù)化成百分數(shù):
1
5
=
2
5
=
1
8
=
1
4
=
3
4
=
56
100
=
3
2
=
3
8
=
3
20
=
7
20
=
6
20
=
7
25
=
7
50
=
3
24
=
9
10
=
7
10
=
分析:分數(shù)化百數(shù),分母是100的分數(shù),直接改寫成百分數(shù)號即可,即去掉分母,添上百分號(%);一般分數(shù)化百分數(shù),首先把分數(shù)化成小數(shù),再把小數(shù)點向右移動兩位,添上百分號(%)即可,如果不能化成有限小數(shù),根據(jù)需要取近似值,一般百分號前保留一位小數(shù).
解答:解:
1
5
=0.2=20%;
2
5
=0.4=40%;
1
8
=0.125=12.5%;
1
4
=0.25=25%;
3
4
=0.75=75%;
56
100
=56%;
3
2
=1.5=150%;
3
8
=0.375=37.5%;
3
20
=0.15=15%;
7
20
=0.35=35%;
7
10
=0.7=70%;
7
25
=0.28=28%;
7
50
=0.14=14%;
3
24
=0.125=12.5%;
9
10
=0.9=90%.
故答案為:20%,12.5%25%,75%,56%,150%,37.5%,15%,35%,70%,28%14%,12.5%,90.
點評:本題是考查分數(shù)化百分數(shù),屬于基礎知識,要掌握.
練習冊系列答案
相關(guān)習題

科目:小學數(shù)學 來源:小學隨堂優(yōu)化作業(yè)·五年級數(shù)學下冊(配人教課標版) 人教課標版 題型:038

把下面的分數(shù)化成小數(shù),并按要求取近似值.

  (精確到百分位)

(保留三位小數(shù))  (精確到十分位)

查看答案和解析>>

同步練習冊答案