百分数小数的互化

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,百分数与小数的互化,0.45 1.2 0.367,复习一,先把下面的小数化成分数，再说一说小数化分数的方法,先化成分母是,10,、,100,、,1000,的分数，再约分。,小数分数,三天打渔两天晒网,十二分满意,褒贬参半,50%,120%,60%,、,40%,返回,1,把,0.24,、,1.4,、,0.123,化成百分数。,0.24,1.4,0.123,百分数是分母为,100,的特殊分数。,123,1000,24,100,24%,140%,14,10,140,100,12.3,100,12.3%,小数,分母是,100,的分数,百分数,做一做,把下面各数化成百分数。,0.51,51%,207%,2.07,0.025,4,2.5%,400%,想一想：怎样能很快地把小数化成百分数？,51,51,.,%,0,把小数化成百分数，只要把小数点,向右移动两位,，同时在后面添上百分号。,.,2,把,27%,、,135%,、,0.4%,化成小数。,27%,135%,0.4%,27,100,0.27,1.35,135,100,0.4,100,0.004,百分数,小 数,做一做,把下面各百分数化成小数。,21%,0.21,0.9,90%,4.5%,0.045,想一想：怎样能很快地把百分数化成小数？,21,%,0,把百分数化成小数，只要把百分号去掉，同时把小数点,向左移动两位,。,.,21,.,0,我的收获,今天我学习了百分数和小数的,互化，我能算：,1,、小数化成百分数。,0.7,()%,5,()%,1.08,()%0.305,()%,2,、百分数化成小数或整数。,150%,（）,500%,（）,0.4%,（）,1.75%,（）,70,500,108,305,1.5,5,0.004,0.0175,返回,