冀教版五数认识正负数说课课件.ppt

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1、初步认识正负数,-六道河中心小学赵继凤,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,初步认识正负数,初步认识正负数,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,初步认识正负数说教材1说教学过程 3说学情 2Ev,教材对比,教材地位,

2、教学目标,教学重难点,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,教材对比教材地位教学目标教学重难点说教材Evaluation,一、说教材,人教版,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,一、说教材人教版Evaluation o

3、nly.,冀教版教材,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,冀教版教材Evaluation only.,冀教版,人教版,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,冀教版人教版Evaluation only.,人教版,冀教版,

4、Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,人教版冀教版Evaluation only.,教材地位,基础,启后,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,教材地位基础启后Evaluation only.,教学目标,Evaluati

5、on only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,知识技能初步认识负数，掌握正负数的读写法；过程方法借助温,教学重、难点,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,重点初步认识负数，掌握正、负数的读写方法难点会比较两个负,二、说学情,已认识自然数、分数

6、、小数，有用直线上的点表示自然数的基础学生有学习新知的生活经验,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,二、说学情已认识自然数、分数、小数，有用直线上的点表示自然,三、教学流程,环节一,口算,环节三,自学,环节四,展示,环节二,情景,环节五,反馈,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copy

7、right 2004-2011 Aspose Pty Ltd.,三、教学流程环节一口算环节三自学环节四展示环节二情景环节五反,口算,1.30.6=0.37.2=3.70.3=3.30.3=2.81.4=0.60.6=1060=4.10.9=7.3+3.7=5.4+4.6=5.810.1=8.3100=,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,口算1.30.6=0.37.2=3.7,创设情景,Evaluatio

8、n only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,创设情景Evaluation only.,自学,1、什么是负数？怎样读、写？举出几个例子,完成后，在小组内进行交流,2、什么是正数？怎样读、写？举出几个例子,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,自学

9、1、什么是负数？怎样读、写？举出几个例子完成后，在小组内,展示,（一）对正负数的理解,+1.5，2.3，,如果学生举的例子都是整数的话，在黑板上随机这几个数进行判断,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,展示（一）对正负数的理解+1.5，2.3，,（二）在数轴上表示正负数并比较大小,正数,负数,从左向右数越来越大,负数中的数字越大，该数越小,负数0正数,Evaluation only.Created wit

10、h Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,（二）在数轴上表示正负数并比较大小正数负数从左向右数越来越大,尝试应用,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,尝试应用Evaluation only.,反馈,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,反馈Evaluation only.,课下活动,Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.,课下活动Evaluation only.,