北师大版二年级下册拨一拨备课讲稿.ppt

,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,练习四,北师大版 二年级上册 第六单元 测量,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4,2,3,1,认真观察，你可以得出在量物体长度时应该注意哪些？在读数时又应该注意哪些呢？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,厘米,米,厘米,厘米,米,米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,想一想，在测量线段时，应该如何摆放尺子？,5,5,3,4,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.,小组讨论一下，可以怎样测量？,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.,课后动手小实践：将这个小知识读给爸爸妈妈听。按照“尺”和“寸”的标准，请爸爸妈妈帮忙测量你睡的床的长和宽大约各是多少。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,说说我的知识小收获！,长度单位：,厘米、,米,1,米,=100,厘米,厘米和米有什么区别吗？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你会画吗？,画一条比,8,厘米,短,4,厘米的线。,画一条比,8,厘米,长,6,里面的线。,8,-,4,=,4,（厘米）,8+6,=,14,（厘米）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3m,132cm,50cm,选择哪个更合适？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,我给它们排排队！,1m,1m,3cm,1cm,100m,88cm,100m,1m3cm,1m,88cm,1cm,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,开动你的小脑筋！,1,、一根,10,米长的竹竿竖直插入河里后，露出,3,米，你知道河水有多深吗？（插入泥里的部分忽略不计）,2,、把两根长是,10,米的铁条焊接为一根，焊接重叠的部分是,1,米，焊接后铁条长多少米？,3,、一根绳子长,20,米，第一次剪下,5,米，第二次剪下,6,米，这根绳子比原来短了多少米？,10-3=7（米）,10+10-1=19（米）,5+6=11（米）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,