北师大版五年级下册《分数乘法一》PPT说课材料.ppt

,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 五年级下册 第三单元 分数乘法,第一课时,第二课时,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把下列加法算式改写成乘法算式。,3+3,5+5+5,8+8+8+8,思考:整数乘法表示的意义?,表示,几个相同加数,的,和,的简便运算。,=3,2,=5,3,=8,4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1个 占整张纸条的 ，3个 占整张纸条的几分之几？,3,3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2个 的和是多少？请涂一涂。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,算一算，说一说分数与整数相乘如何计算。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,分数乘整数,分子和整数相乘,分母不变。,你能总结分数与整数相乘的计算方法吗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.4个 是多少？涂一涂，算一算。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.填一填，与同伴交流为什么可以这样计算。,9,4,2,9,8,11,3,2,11,6,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你能看懂下面两位同学的计算过程吗？与同伴说一说。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算下面各题，观察每个题目及结果，你发现了什么？,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,两个数相乘，一个乘数不变，另一个乘数缩小几分之几（或扩大几倍），积也缩小几分之几（或扩大几倍）。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.下面是乐乐的算法，你能看懂吗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,5.一个漏水的水龙头每时漏水 桶，5时漏水多少,桶？10时呢？24时呢？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,6.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,7.爸爸吃了这个蛋糕的几分之几？,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,8.,爸爸和乐乐都感冒了妈妈要给他们买3天的药。,爸爸和乐乐一天分别要吃多,少袋？,妈妈总共需要买多少袋药？,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,新北师大版五年级下册数学全册课件下载页面：,only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,9.百米赛跑。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,绿色圃中小学教育网www.L 绿色圃中学资源网cz.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,