北师大版小学四年级下册数学《比大小》课件PPT教程文件.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,绿色圃中小学教育网,*,绿色圃中小学教育网,*,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,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,绿色圃中小学教育网,*,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,*,北师大版四年级数学下册,比大小,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,谁的得分高？,9.87,9.90,相等,8比9小,小强,小刚,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,5.63,米,1.8,米,比一比,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,我的身高是1.41米。,我的身高是1.36米。,比一比,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,现在公布跳远成绩：,姓名,成绩/米,小明,3.05,小强,2.84,小刚,2.88,小军,2.93,你能给他们排出名次吗？,Evaluation only.,Created with AsposeSlides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,3.05,2.,3,2,3,2,先比较整数部分。,姓名,成绩/米,小明,3.05,小强,2.84,小刚,2.88,小军,2.93,小明跳得最远。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,2.93,2.8,2,2,8,9,整数部分相同，,就比较十分位。,8,9,姓名,成绩/米,小明,3.05,小强,2.84,小刚,2.88,小军,2.93,小强、小刚没有小军跳得远。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,2.88,2.84,2,2,4,8,想一想：,怎样比较两个小数的大小？,4,8,8,8,姓名,成绩/米,小明,3.05,小强,2.84,小刚,2.88,小军,2.93,小刚比小强跳得远。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,1.21,1.23,4,4,5,7,0.54,0.57,4,7,试一试,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,8,9,10,在上图中找到8.5和9.2的位置，并比较它们大小。,8.5,9.2,8.59.2,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,姓名,时间/秒,王红,58.09,张莉,58.17,李玫,59.02,赵敏,58.52,右面是航模比赛飞行时间记录表。你能给她们排出名次吗？,飞行时间越长，成绩越好！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,在 里填上“”或“=”。,2.3 3.3,0.93 0.94,0.057 0.053,0.99 1,6.9 6.8,4.50 4.5,=,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,4.9,3.7,4.0,5.1,4.2,请把这些小鱼从小到大的顺序排列起来。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,小明不小心抄丢了小数点，请在适当的位置写上小数点，使这个式子成立。,796,883,688,524,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,比较0.1米、0.10米和0.100米的大小。,因为 1分米=10厘米=100毫米，,所以 0.1 米=0.10 米=0.100 米。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.1 米=0.10 米=0.100 米。,小数的尾数有什么变化？,小数的大小有什么变化？,你能得出什么结论？,在小数的末尾添上“0”，小数的大小不变。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比较0.30和0.3的大小。,在小数的末尾去掉“0”，小数的大小不变。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把0.70和105.0900化简,0.70=0.7,105.0900=105.09,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.,不改变小数的大小，把下面各数,改写成小数部分是三位的小数。,0.2 4.08 3,0.2=0.200,4.08=4.080,3=3.000,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把下面两组中相等的数用线连接起来。,0.720,8.09,30.60,1.5,1.500,30.6,0.72,8.090,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数是我国最早提出和使用的。早在公元三世纪，我国古代数学家刘微在解决一个数学难题时就提出了把整个位以下无法标出名称的部分称为微数。,小数的名称是公元十三世纪我国元代数字家朱世杰提出的。在十三世纪中我国出现了低一格表示小数的记法，如把63.12写成|_|。,在西方，小数出现很晚。直到十六世纪，法国数学家克拉维斯首先用了小数点作为整数部分与小数部分分界的记号。,小数的历史,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,