0.25 25%
0.125
10% 0.2 20%
0.375
5% 0.75 75%
0.625
4% 0.4 40%
0.875
2% 0.6 60% 0.8 80%
分析:百分?jǐn)?shù)化小數(shù)的方法:去掉百分號(hào),把小數(shù)點(diǎn)向左移動(dòng)兩位;
百分?jǐn)?shù)化分?jǐn)?shù)的方法:先寫(xiě)成分?jǐn)?shù)的形式,再進(jìn)一步化簡(jiǎn)成最簡(jiǎn)分?jǐn)?shù)
小數(shù)化百分?jǐn)?shù)的方法:小數(shù)點(diǎn)向右移動(dòng)兩位,同時(shí)填上百分號(hào);
小數(shù)化分?jǐn)?shù)的方法:一位小數(shù)表示十分之幾,兩位小數(shù)表示百分之幾,三位小數(shù)表示千分之幾…先寫(xiě)成分?jǐn)?shù)的形式,再進(jìn)一步化簡(jiǎn)成最簡(jiǎn)分?jǐn)?shù);
分?jǐn)?shù)化小數(shù)的方法:用分?jǐn)?shù)的分子除以分母即得小數(shù)商,除不盡時(shí)通常保留三位小數(shù);
分?jǐn)?shù)化百分?jǐn)?shù)的方法:先把分?jǐn)?shù)化成小數(shù),再進(jìn)一步化成百分?jǐn)?shù);據(jù)此進(jìn)行計(jì)算互化即可.
解答:
解:=0.25=25%, | =0.125=12.5% |
=0.1=10%, | =0.2=20%, |
=0.375=37.5%, | =0.05=5%, |
=0.75=75%, | =0.625=62.5%, |
=0.04=4%, | =0.4=40%, |
=0.875=87.5% | =0.02=2%, |
=0.6=60%, | =0.8=80%. |
點(diǎn)評(píng):此題考查分?jǐn)?shù)、小數(shù)和百分?jǐn)?shù)的互化,掌握方法,正確轉(zhuǎn)化即可.