百分数和小数的互化.pptx

,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,1,、填一填,7,100,（）,%,=,287,100,（）,%,=,7,287,2.7%=,(),100,140%=,2.7,(),100,140,复习,2.,把下面的小数化成分数,1.4,14,10,0.3,3,10,731,1000,0.731,30,100,140,100,73.1,100,帮小猪排队，按从大到小的顺序排列。,1.4,0.123,27%,124%,0.4,100,140,1,把,0.24,、,1.4,、,0.123,化成百分数。,0.24 =,=24%,1.4 =,=140%,0.123 =,=12.3%,24,100,1000,123,10,14,100,12.3,做一做：,把下面小数化成百分数,0.97=,8,100,97,100,0.08=,0.132=,0.005=,8%,=,97%,=,13.2%,=,0.5%,=,5,1000,=,0.5,100,132,1000,=,13.2,100,2,把,27%,、,135%,化成小数。,27%=,=0.27,135%=,=1.35,27,100,135,100,做一做：,把,百分数,化成,小数,97%=,8%=,0.5%=,13.2%=,8,100,97,100,0.97,=,0.132,=,0.005,=,0.08,=,0.5,100,13.2,100,0.97,0.08,0.132,0.005,8%,=,97%,=,13.2%,=,0.5%,=,仔细观察，你发现了什么？,小数 百分数,97%,8%,0.5%,13.2%,0.97,=,0.132,=,0.005,=,0.08,=,百分数 小数,课堂体验：,把下面的小数化成百分数，,百分数,化成,小数,2.1=0.313=18.5%=1.07=,26.34%=59.8%=1.41=0.69=,210%,31.3%,0.185,107%,0.2634,0.598,141%,69%,小游戏,:,连连看,11%,0.55,0.11,27%,1.63,2%,55%,163%,0.02,0.27,判断下面各题是否有错,（,1,）,24.5%=0.245 (),（,2,）,0.8%=0.08 (),（,3,）,0.007=7%(),（,4,）,0.36=36 (),0.008,0.7%,36%,帮小猪排队，按从大到小的顺序排列。,1.4,0.123,27%,124%,0.4,帮小猪排队，按从大到小的顺序排列。,1.4=140%,0.123,27%,124%,0.4,帮小猪排队，按从大到小的顺序排列。,0.123=12.3%,27%,124%,0.4,1.4=140%,帮小猪排队，按从大到小的顺序排列。,27%,124%,0.4=40%,1.4=140%,0.123=12.3%,因为：,140%,124%,40%,27%,12.3%,所以：,1.4,124%,0.4,27%,0.123,下一张,返回,帮小猪排队，按从大到小的顺序排列。,1.4,0.123,27%=0.27,124%,0.4,帮小猪排队，按从大到小的顺序排列。,1.4,0.123,124%,0.4,27%=0.27,帮小猪排队，按从大到小的顺序排列。,1.4,0.123,124%=1.24,0.4,27%=0.27,所以：,1.4,124%,0.4,27%,0.123,因为：,1.4,1.24,0.4,0.27,0.123,下一张,返回,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“”；把百分数化成小数，只要,把“”去掉，同时把小数点向左移动两位。,百分数和小数的互化,