人教新课标数学五年级上册第五单元(平行四边形的面积）PPT课件.ppt

《人教新课标数学五年级上册第五单元(平行四边形的面积）PPT课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、平行四边形的面积人教新课标五年级数学上册Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0

2、.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5Clie

3、ntProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.高底宽长平行四边形底高面积长方形长宽面积6米4米24平方米6米4米24平方米(一个方格代表1m2，不满一格的都按半格计算)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright

4、2004-2011AsposePtyLtd.1.利用你手中的学具,剪一剪、拼一拼，试把平行四边形转化为长方形。2.观察拼出的长方形和原来的平行四边形，你发现了什么？3.由长方形的面积=长×宽,你发现平行四边形面积的计算方法是什么?自探提示Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0

5、.Copyright2004-2011AsposePtyLtd.高底宽长平行四边形面积的计算结论:平行四边形转化成了长方形所以:平行四边形的面积=底×高因为:长方形的面积=长×宽平行四边形可以转化成一个长方形，长方形的面积与原来平行四边形的面积＿＿＿。长方形的长与原来平行四边形的底＿＿＿。长方形的宽与原来平行四边形的高＿＿＿。相等相等相等Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.Cre

6、atedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.S=ahahsEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyL

7、td.沿平行四边形的任意一条高剪开、平移，都可以得到长方形。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.S