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,*,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,内容：,子页题目,子页,子页,子页,子页,主页,子页,子页题目,子页,子页,子页,主页,子页,T,H,A,N,K,Y,O,U,北师大版 四年级下册 第三单元 小数乘法,问题,探究,练习,拓展,绿色圃中小学教育网 :/ Lspjy,绿色圃中小学教育网 :/ Lspjy,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 =,125 =,720 =,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？,文 具 店,答：买,4,块橡皮需要,0.8,元。,买,4,块橡皮需要多少钱？,绿色圃中小学教育网 :/ Lspjy,绿色圃中小学教育网 :/ Lspjy,笑笑是这样做的，你能看懂吗？,0.24, （ ）,买,3,把尺子需要多少元？,0.43, （ ）,1,2,3,0.4,元,4,角,3412角,12,角,1.2,元,0.431.2元,0.4,0.4,0.4,答：买,3,把尺子需要,1.2,元。,1.2,元,小数乘整数的意义与整数乘法的意义一样，都是求几个一样加数的和的简便运算。,2+2+2+2=2x4,0.2+0.2+0.2+0.2=0.2x4,算一算：,0.71 =,0.15 =,0.46 =,0.3 5 =,0.024 =,0.087 =,0.7,0.5,2.4,1.5,0.08,0.56,比一比，谁最快,0.83 =,70.5 =,1.42 =,0.710=,0.065 =,40.09 =,0.0115=,2.1 4 =,2.4,3.5,2.8,7,0.3,0.36,0.15,8.4,40.3 = 0.3 4,乘法交换律,你能计算,40.3,吗？与同学交流你的想法。,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,小时,可以走多少千米？,单价,x,数量,=,总价,3.23 = 9.6,(,元,),速度,x,时间,=,路程,5 1.5 = 7.5,(,千米,),解决问题：,1.,一支钢笔,3.5,元，买,8,支要多少元？,2.,一根跳绳要,2.6,米，做,12,根要用多长？,3.5x8=28元,2.6x12=31.2米,1.,买,4,把卷笔刀需要多少元？涂一涂，算一算，,与同伴交流你的想法。,绿色圃中小学教育网 :/ Lspjy,绿色圃中小学教育网 :/ Lspjy,2.8,元,2.,买,6,支铅笔需要多少元？与同伴交流你的想法。,60.3=,1.8,元,答：,买,6,支铅笔需要,1.8,元,3.,0.33,0.28,40.2,30.5,0.44,0.19,0.72,60.2,0.64,0.9,1.5,1.4,1.6,1.6,1.2,0.8,0.9,2.4,4.,涂一涂，填一填。,0.1,1,0.5,绿色圃中小学教育网 :/ Lspjy,绿色圃中小学教育网 :/ Lspjy,5.,
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