北师大版小学四年级下册数学《小数的意义》课件PPTdoc资料.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,*,小数的意义,The definition of decimal,北师大版四年级数学下册,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,教学目标,本节课我们主要来学习小数的意义，同学们结合实际的例子理解小数的意义，能够用小数表示生活中一些常见的量，能够解决相关的实际问题。,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元6角4分=（）元,4.64,10元5角=（）元,=（）元,10.50,10.5,7分=（）元,0.07,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,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,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,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,小数,decimal number,小数点,decimal point,3.5,1.06,16.85,这样的数，都是小数。,The numbers like,three point five,one point zero six,sixteen point eight five,are decimal numbers.,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,1,10,1,把“1”平均分成10份，其中的1份是 ，也可以表示0.1。,其中的3份是 ，也可以表示0.3。,10,3,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,100,1,把“1”平均分成100份，其中的1份是 ，也可以表示（）。,0.01,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,100,23,其中的23份是（），也可以表示（）。,0.23,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,1000,1,把“1”平均分成1000份，其中的1份是（），也可以表示（）。,0.001,想一想：,其中的59份是（），也可以表示（）。,1000,59,0.059,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,把“1”平均分成10份，其中的1份或几份可以用一位小数表示；,平均分成100份，其中的1份或几份可以用两位小数表示；,平均分成1000份，其中的1份或几份可以用三位小数表示；,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,分数：,小数：,10,7,0.7,1.把下图中涂色的部分分别用分数和小数表示出来。,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,分数：小数：,100,32,0.32,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,+=,1,0.6,1.6,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,+=,3,0.2,3.2,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,+=,2,0.9,0.05,2.95,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,看图写出分数和小数。,分数：,小数：,10,6,0.6,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,10,2,0.2,100,45,0.45,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,读出下面的小数，并写出它们所表示的意义。,0.9读作：,表示：,0.304读作：,表示,0.06读作：,表示：,零点九,十分之九,零点三零四,千分之三百零四,零点零六,百分之六,100,6,1000,304,10,9,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,1,10,=0.1,3,10,=0.3,9,10,=0.9,1,100,=0.01,5,100,=0.05,25,100,=0.25,1,1000,=0.001,8,1000,=0.008,36,1000,=0.036,观察上面分数和小数，你有什么发现？,分母是10、100、1000的分数可以用小数表示；,分母是,10,的分数用,一位小数,表示；,分母是,100,的分数用,两位小数,表示；,分母是,1000,的分数用,三位小数,表示。,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,0.2是（）位小数，它表示（）分之（）。,0.15是（）位小数，它表示（）分之（）。,0.008是（）位小数，它表示（）分之（）。,1.填空,一,十,二,二,百,十五,三千,八,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,0.3,0.03,0.003,0.19,0.017,0.409,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,10,1,0.7,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,0.03,100,5,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,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,0.3里面有（）个十分之一,0.05里面有（）个百分之一,0.009里面有（）个千分之一,3,5,9,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）0.9里面有（）个0.1。,（2）0.07里面有（）个()。,（34个（）是0.04。,9,7,0.01,0.01,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）联系整数、分数的计数单位，,你能说出小数的计数单位吗？,一位小数表示十分之几，计数单位,是十分之一，写作（）,两位小数表示百分之几，计数单位,是百分之一，写作（）,0.1,0.01,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,三位小数表示千分之几，计数单,位是千分之一，写作（）,0.001,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,看数拨珠,20,+2,+0.2,+0.02,+0.002,=22.222,2 2 2 2 2,百位,十位,个位,十分位,1,10,表示2个 ，也可以表示2个0.1。,百分位,千分位,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,看数拨珠,20,+2,+0.2,+0.02,+0.002,=22.222,2 2 2 2 2,百位,十位,个位,十分位,1,100,表示2个 ，也可以表示2个0.01。,百分位,千分位,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,看数拨珠,20,+2,+0.2,+0.02,+0.002,=22.222,2 2 2 2 2,百位,十位,个位,1,1000,表示2个 ，也可以表示2个0.001。,十分位,百分位,千分位,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,表示3个10，也就是30这个“3”表示多少？,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,这个“3”表示多少？,表示3个 ，也可以表示3个0.1。,10,1,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,这个“3”表示多少？,表示3个 ，也可以表示3个0.01。,100,1,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,这个“3”表示多少？,表示3个 ，也可以表示3个0.001。,1000,1,33.333读作：,三十三点三三三。,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,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 2 0 3,读作：,十二点零三,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 0 4 1 0 4,读作：,一百零四点一零四,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,说出24.375小数部分，每个数位上的数各表示几个几分之一。,2 4 .3 7 5,3个十分之一,7个百分之一,5个千分之一,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 52.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色圃中小学教育网,1、0.45是由()个0.1和()个0.01组成的。,2、0.306是由3个()和6个()组成的。,4,5,0.1,0.001,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）在3.033中,从左往右看,第一个3在()位上,它表示();,第二个3在()位上,它表示();第三个3在()位上,它表示();,个,3个一,百分,3个百分之一,千分,3个千分之一,3个0.01,3个0.001,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,0.4的计数单位是（），它有（）个这样的计数单位；,0.07的计数单位是（），它有（）个这样的计数单位；,0.138的计数单位是（），它有（）个这样的计数单位。,十分之一,4,百分之一,7,千分之一,138,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,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,4.8中的4在（）位上，表示（）个（）；,8在（）位上，表示（）个（）。,1.填空,个,4,一,十分,8,十分之一,0.25中的2在（）位上，表示（）个（）；,5在（）位上，表示（）个（）。,十分,2,十分之一,百分,5,百分之一,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,