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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,*,百分数与小数的互换,热身运动,:,你能把下面的小数化成分数吗?,0.731,1.99,0.1 0.23,你能把下面的分数化成小数吗?,0.7,0.51,0.374,1.3,3.,把下面的分数化为百分数,.,7%,35%,1.8%,287%,27%,124%,0.4%,0.25,1.4,0.123,谁能帮我们按从大到小的顺序排列,?,小数,百分数,你可以把它们变成同一类型的数吗?,情景导入,小数,百分数,小数点向右移动两位,加上,%,0.25,0.123,1.4,25%,12.3%,140%,你发现了什么?,解决问题,:,你能把下面的小数化成百分数吗?,0.38,1.05,38%,300%,5.5%,105%,0.055 3,小数,百分数,27%,124%,0.4%,0.27,1.24,0.004,你发现了什么?,去掉,%,小数点向左移动两位,解决问题,:,1.,把下面各个百分数化成小数,.,15%,80,%,3.5%,135,%,0.15,0.035,0.8,1.35,27%,124%,0.4%,0.25,1.4,0.123,从大到小排列:,小数,百分数,小数点向右移动两位,加上,%,去掉,%,小数点向左移动两位,比较大小,:,0.52,52,%,1.2 12.3,%,254%0.254,0.25,%,0.025,把相等的数用线连起来:,0.25,72%,0.415,106%,1.3,17.6%,130%,0.176,25%,0.72,1.06,41.5%,判断,对的打“”,错的打“,”,。,1,、,1.041=1041%,(),2,、,2%=0.02,(,),3,、,100%=1,(),4,、,300%=0.3,(),5,、,0.8%=0.08,(),欢迎指教,
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