文具店课件.ppt

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,*,文具店,-,小数乘法,(,一,),2,、一,支,圆珠笔,2,元，买,4,支要多少钱？,2 4=,2+2+2+2=,1,、口 算：,254=,12 5=,7 20=,2.5+2=,3002=,2,角,4=,3.6-2.4=,4.7+2.6=,5 1.8=,你获得了什么信息？,你能提出什么数学问题？,买,4,块橡皮需要多少元？,买,4,块橡皮需要多少元？,方法二,：,方法三：,需要,0.8,元,方法一：,个位,十位,十分位,百分位,0.2,0.4,0.6,0.8,0.3,3,0.9,0.8,0.4,2,算一算：,0.71=,0.1 5=,0.46=,0.35=,0.024=,0.087=,0.7,0.5,2.4,1.5,0.08,0.56,40.3 =0.3 4,你能,计算,40.3,吗？与同学交流你的想法。,0.1,0.5,1,10,比一,比，谁最快,0.83=,70.5=,1.42=,0.710=,0.065=,40.09=,0.0115=,2.1 4=,2.4,3.5,2.8,7,0.3,0.36,0.15,8.4,1,、每千克苹果,3.2,元，妈妈买了,3,千克，,一共要用多少元？,解决问题：,2,、小明每小时走,5,千米，,1.5,可以走多少千米？,3.2 3=9.6,(,元,),5 1.5=7.5,(,千米,),