北师大版小学四年级下册数学第三单元三、街心广场知识讲解.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 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www.L,绿色圃中小学教育网www.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,20米,30米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,先说一说街心广场上的数学信息，再算一算，填一填。,街心广场,花坛,地砖,面积/平方米,绿色圃中小学教育网www.L,绿色圃中小学教育网www.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,淘气在计算地砖的面积时遇到了困难，你能帮帮他吗？,0.30.2 （）,0.3m3dm,0.2m2dm,326（dm,2,）,6dm,2,0.06（m,2,）,0.30.20.06（m,2,）,0.3米,0.2米,32,1米,1米,0.01平方米,6个0.01是0.06平方米。,0.06 平方米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,结合上面的计算过程，想一想乘数和积之间有什么关系。,30,20,600,3,2,6,0.3,0.2,0.06,缩小到原来的,缩小到原来的,缩小到原来的,缩小到原来的,缩小到原来的,缩小到原来的,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,积的小数位数与乘数的小数位数有什么关系？,算一算，想一想。,0.12,40.31.2,0.40.3,0.132,0.130.2,第一个乘数,的小数位数,第二个乘数,的小数位数,积的小数位数,0.26,0.026,0,1,1,1,1,2,2,0,2,2,1,3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.你会计算这块拼图的面积吗？想一想，算一算。,与同伴交流你的想法。,结合计算过程说一说，积的,小数位数与乘数的小数位数,有什么关系？,绿色圃中小学教育网www.L,绿色圃中小学教育网www.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.你会计算这块拼图的面积吗？想一想，算一算。,与同伴交流你的想法。,结合计算过程说一说，积的,小数位数与乘数的小数位数,有什么关系？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.根据第一栏的积很快写出后面每栏的积。,乘数,36,3.6,36,3.6,0.36,乘数,24,2.4,2.4,24,2.4,积,864,8.64,86.4,86.4,0.864,绿色圃中小学教育网www.L,绿色圃中小学教育网www.L,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.淘气的计算器上的小数点无法显示了，你能帮,他得到正确答案吗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.明明每天上学和放学都要乘坐一次公交车，每乘,一次公交车花0.2元。明明的公交卡里还剩3元，,够他一周5天上学和放学用吗？,0.220.4（元）,0.452（元）,够他一周5天上学和放学用。,新北师大版四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.,5.根据13,12156，在 里填上适当的数。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,