【題目】分數(shù)、百分數(shù)、小數(shù)互化. 例:=0.5=50%
= = | = =12.5% |
=0.1= | = = |
= =37.5% | =0.05= |
= = | = =62.5% |
=0.04= | = = |
= =87.5% | =0.02= |
= = | = = . |
【答案】
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%. |
【解析】
試題分析:百分數(shù)化小數(shù)的方法:去掉百分號,把小數(shù)點向左移動兩位;
百分數(shù)化分數(shù)的方法:先寫成分數(shù)的形式,再進一步化簡成最簡分數(shù)
小數(shù)化百分數(shù)的方法:小數(shù)點向右移動兩位,同時填上百分號;
小數(shù)化分數(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…先寫成分數(shù)的形式,再進一步化簡成最簡分數(shù);
分數(shù)化小數(shù)的方法:用分數(shù)的分子除以分母即得小數(shù)商,除不盡時通常保留三位小數(shù);
分數(shù)化百分數(shù)的方法:先把分數(shù)化成小數(shù),再進一步化成百分數(shù);據(jù)此進行計算互化即可.
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%. |
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