题目内容
【题目】分数、百分数、小数互化. 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】
试题分析:百分数化小数的方法:去掉百分号,把小数点向左移动两位;
百分数化分数的方法:先写成分数的形式,再进一步化简成最简分数
小数化百分数的方法:小数点向右移动两位,同时填上百分号;
小数化分数的方法:一位小数表示十分之几,两位小数表示百分之几,三位小数表示千分之几…先写成分数的形式,再进一步化简成最简分数;
分数化小数的方法:用分数的分子除以分母即得小数商,除不尽时通常保留三位小数;
分数化百分数的方法:先把分数化成小数,再进一步化成百分数;据此进行计算互化即可.
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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