北师大版三年级数学上册.植树教学教材.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 三年级上册 第四单元 乘与除,问题,探究,练习,拓展,绿色圃中小学教育网,绿色圃中小学教育网,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.口算,40,5=602=,8004=9003=,25005=21007=,复习,8,30,200,300,500,300,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你能提出什么数学问题？,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,情景导入1,你知道了哪些数学信息？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,36,3,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,情景导入1,平均每班分到多少树苗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,363,一班,二班,三班,30310,632,10212,答：平均每班分到12棵树苗。,12（棵）,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,绿色圃中小学教育网,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,48,4,三（1）班共有48人参加植树，每4人一组，可以分成几组？,情景导入2,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,48,4,40,410,8,42,10212,答：每4人一组，可以分成12组。,12（棵）,三（1）班共有48人参加植树，每4人一组，可以分成几组？,探索新知,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,10,33,3,36,3,39,3,30,3,11,12,13,3,3,3,1,1,1,算一算，你发现了什么？,探索新知,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.分一分，算一算，说说你是怎么想的。,20,6,2,3,20,3,23,23,30,3,10,9,3,3,10,3,13,13,学以致用,提示：先算十位上的数，再算个位上的数。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.,55,511,学以致用,一双鞋子的价钱是一副手套的几倍？,提示：求是谁的几倍，用除法计算。,答：一双鞋子的价钱是一副手套的11倍。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.赛跑。,学以致用,提示：注意计算的准确性。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,484,40410,842,10212,答：每4人一组，可以分成12组。,12（棵）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,10,333,363,393,303,11,12,13,3,3,3,1,1,1,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.分一分，算一算，说说你是怎么想的。,20,6,2,3,20,3,23,23,30,3,10,9,3,3,10,3,13,13,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.,55511,55550（元）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.赛跑。,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.,5.接着写下去，你能写出几个算式？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,课堂小结,大家有什么收获？,1.一位数除两位数的除法计算，可以先用除数去除被除数中整十的部分，再去除被除数的个位数，然后把两次除得的结果合起来。,2.除法计算时用到的乘法口诀要熟练应用。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,