教育专题：百分数与小数互化

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,复习,把下面小数化成分数,0.2 1.5,0.2,1,5,1.5,1,2,1,复习,把下面分数化成小数,2,25,3,5,0.,0,8,2,25,3,5,0.6,复习,把下面各数写成百分数,250,100,12.5,100,250,100,250,12.5,100,12.5,例1,把0.25、1.4、0.123化成百分数,0.25,25,100,25%,1.4,1,4,10,14,10,140%,0.123,123,1000,12.3,100,12.3%,想一想,怎样能很快地把小数化成百分数？,小数,百分数,小数点向右移动两位，添上百分号,做一做,把下面各小数化成百分数,0.3838,0.055,5.5,0.38、1.05、0.055、3,1.05,105,3300,例2,把27,、,124,、0.4,化成小数,27%=,27,100,=,27,100,0.27,124%=,124,100,=,124,100,1.24,0.4%=,0.4,100,=,0.4,100,0.004,想一想,怎样能很快地把百分数化成小数？,百分数,小数,去掉百分号，小数点向左移动两位,做一做,把下面各百分数化成小数,150.15,15 80 3.5,800.8,3.50.035,填空：,0.12=（）%0.561=()%,小数 小数,30%=()126%=(),12,56.1,0.3,1.26,巩固练习,判断(对的打,“,”,错的打,“,”,）,（1）6%=6（）,（2）0.35=3.5%(),巩固练习,小结,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；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,小数,百分数,小数点,向右,移动两位，,添上,百分号,去掉,百分号，小数点,向左,移动两位,谢谢指导！,再见！,