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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,*,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,*,北师大版四年级数学下册,文具店,教学目标,本节课我们主要来学习小数乘法,同学们通过对整数乘法的复习来探索小数乘法的计算方法,能够达到独立解决有关小数乘法的实际问题的水平。,你获得了什么信息?,你能提出什么数学问题?,买,4,块,要多少钱?,0.2,元,0.2,元,0.2,元,0.2,元,买,4,块,要多少钱?,0.2,元,0.2,元,0.2,元,0.2,元,0.2+0.2+0.2+0.2=,0.2,0.2,0.2,0.2,0.8,0.8,(元),答:买,4,块橡皮需要,0.8,元。,方法一:用连加计算,0.2,0.2,0.2,0.2,0.8,方法二:借助直观模型计算,答:买,4,块橡皮需要,0.8,元。,0.24,0.8,(元),方法三:用乘法计算,0.2 4,0.2,元,=2,角,2 4=8,(角),8,角,=0.8,元,0.8,(元),答:买,4,块橡皮需要,0.8,元。,小锦囊:解决小数乘整数的实际问题,还可以利用,单位换算把小数转化成整数再相乘。,1,、小数乘整数,与整数乘法的意义相同,就是求几个相同加数的和,也就是求这个小数的整数倍是多少。,2,、计算小数乘整数,可以用连加,用乘法,也可以用画图,借助模型来计算。,0.3,3,0.9,0.8,0.4,2,涂一涂,填一填。,0.0110=,(),0.1,涂一涂,填一填。,0.0150=,(),0.5,涂一涂,填一填。,0.01100=,(),1,0.01,10,0.01,50,0.5,0.1,4,6,0.4,6,3,2,0.3,2,做一做,6,0.6,24,2.4,0.13,0.52,0.43,0.33,1,个日记本,0.8,元,丁丁要买,3,个这样的日记本,需要多少钱呢?,
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