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%.
故答案為:50%,25%,75%,20%,40%,60%,80%,12.5%,37.5%,62.5%,87.5%,10%.
分析:分?jǐn)?shù)化百數(shù),分母是100的分?jǐn)?shù),直接改寫(xiě)成百分?jǐn)?shù)號(hào)即可,即去掉分母,添上百分號(hào)(%);一般分?jǐn)?shù)化百分?jǐn)?shù),首先把分?jǐn)?shù)化成小數(shù),再把小數(shù)點(diǎn)向右移動(dòng)兩位,添上百分號(hào)(%)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(hào)前保留一位小數(shù).
點(diǎn)評(píng):本題是考查分?jǐn)?shù)化百分?jǐn)?shù),屬于基礎(chǔ)知識(shí),必須掌握.