北师大版四年级数学下册第一单元全课件79334资料讲解.ppt

Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,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,*,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,*,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,*,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,*,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,*,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,*,PPT,模板下载：,PPT,素材下载：,PPT,图表下载：,PPT,教程：,Excel,教程：,PPT,课件下载：,only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,1,、,在下面的括号内填上适当的小数。,5,10,=,（）,9,10,=,（）,4,100,=,（）,999,1000,=,（）,82,100,=,（）,8,1000,=,（）,0.5,0.9,0.04,0.82,0.008,0.999,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,2,、,分别用分数和小数表示图中的阴影部分的面积。,分数（）,小数（）,分数（）,小数（）,2,10,0.2,0.7,7,10,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,3,0.2,3.22,0.02,3,、,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,小数点,小数部分,十分位,十分之一,数 位,计数单位,百分之一,百分位,千分位,千分之一,万分位,万分之一,整数部分,千,个位,一（个）,十位,十,百位,百,千位,0.1,0.01,0.001,0.0001,相邻两个计数单位之间的进率都是,10,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,观察下面的数,说一说这些数有什么特点,?,3.2 2.6 4.62 5.41 0.625 8.375,0.3 8.6 6.25 3.46 7.125 9.135,一位小数,二位小数,三位小数,0.30,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,1,分米也是 米,还可以写成小数是多少米？,1,米,把,1,米,平均分成,10,份，每份长多少分米？,3,分米也是 米,还可以写成小数是多少米？,0.1,米,0.3,米,一位小数表示十分之几,?,1,10,3,10,1,10,3,10,(),米,(),米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,分母是,10,的分数，写成小数是一位小数，所以一位小数表示,十,分之几，,它的计数单位是十分之一（,0.1);,数位是十分位。,Evaluation only.,Created with Aspose.Slides for.NET 35 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,0.01,米,1,厘米,2 3 4 5 6 7 8 9 10,0.07,米,米,米,把,1,米,平均分成,100,份,每份长多少厘米？,1,厘米是几分之几米？还可以写成小数是多少米？,7,厘米是几分之几米？还可以写成小数是多少米？,两位小数表示百分之几,?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,分母是,100,的分数，写成小数是两位小数，所以两位小数表示,百,分之几，,它的计数单位是百分之一（,0.01);,数位是百分位。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,0.001,米,0.008,米,0.013,米,1,厘米,米,米,米,把,1,米,平均分成,1000,份，每份是多少毫米？,1,毫米是几分之几米？还可以写成小数是多少米？,8,毫米是几分之几米？还可以写成小数是多少米？,13,毫米是几分之几米？还可以写成小数是多少米？,三位小数表示千分之几,?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,分母是,1000,的分数，写成小数是三位小数，所以三位小数表示,千,分之几，,它的计数单位是千分之一（,0.001);,数位是千分位。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,分母是,10,、,100,、,1000,的分数都可以用小数表示。,一位小数表示十分之几，两位小 数表示百分之几，三位小数表示千分之几,这就是小数的意义。,30.03中整数部分的3在()位上,它的计数单位是(),表示3个();小数部分的3在()位上,它的计数单位是(）,表示3个()。,十,十,十,百分,百分之一,0.01,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,1,、小数的计数单位是,（,),（）、,（）、（）,分别写作（）、,（）、（）,每相邻两个计数单位间,的进率是（）。,2,、,0.8,里有（）个十分之一；,0.08,里有（）个百分之一；,0.008,里有（）个千 分之一；,3,、,0.175,是由,1,个（）、,7,个（）和（）,0.001,组成的；,6,个（）是,0.06,。,十分之一,百分之一,千分之一,万分之一,0.1,0.01,0.001,10,8,8,8,0.1,0.01,5,0.01,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数的意义,写出箭头所指的小数。,0,1,2,3,0.4,(,),1.3,(),(),0.9,1.8,2.6,(),(),(),(),0.1,0.2,0.3,0,(),0.04,0.09,0.13,0.18,0.26,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,例：2,1元有10角。,1元,1角,1角就是 元，还可以写成 元；,2角就是 元，还可以写成 元；,0.1元,0.1,0.2元,0.2,=,=,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,把,1,米平均分成,1000,份，每份长,1,毫米。,1,毫米是 米，还可以写成（）米。,0.001,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,例,2,：把,1,米平均分成,100,份，每份长,1,厘米。,1,厘米是 米，还可以写成,0.01,米。,1,100,1,厘米,0.01,米,4,厘米,9,厘米,米,1,100,米,9,100,米,4,100,0.09,米,0.04,米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,大化小,才好 （乘以进率，小数点向右移动）,小化大,一下 （除以进率，小数点向左移动）,8,8,厘米就是（）米，就是（）米。,53,53,克就是（）千克，就是（）千克。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,想想填填：,1.,7,分米是,1,米的 ，写成小数是 米。,2.,5,角是,1,元的 ，写成小数是 元；,9,分,是,1,元的 ，写成小数是 元。,3.,15,米是,1,千米的 ，写成小数是 千米。,7,10,5,10,0.7,0.5,0.09,0.015,9,100,15,1000,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,千克克,千克,千克,千克,千克,吨,吨,24,24,56,56,1吨=1000千克,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,在进行测量的时候，往往不能得到整数的结果，也常常用小数来表示。,9分米,分数表示,小数表示,79厘米,3毫米,米,米,米,米,米,米,10,9,0.9,100,79,0.79,1000,3,0.003,长度,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,小青身高1米4分米，如果用米作单位，4分米可以写成（）米，合起来写成（）米。,0.4,1.4,4,分米,（）米,1,米,4,分米（）米,大化小,才好 （乘以进率，小数点向右移动）,小化大,一下 （除以进率，小数点向左移动）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,用小数表示下面的数,7,分米（）米,6,角（）元,356,千克（）吨,52,分（）元,45,克（）千克,63,厘米（）米,1,千克,235,克（）千克,15,元,7,角,8,分（）元,3,米,2,分米（）米,4,米,8,分米（）米,2,吨,350,千克（）吨,1,米,75,厘米（）米,4,米,50,厘米（）米,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,28,100,8,1000,千克,23,100,平方米,4,100,米,4,10,米,0.4,米,0.28,0.04,米,0.23,平方米,0.008,千克,0.625,吨,625,1000,吨,连,一连：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,（,1,）,0.8,是把整数“,1”,平均分成,10,份，表示 这样的（）份。,（,2,）,030,是把整数“,1”,平均分成,100,份，表示 这样的（）份。,（,3,）,0.137,是把整数“,1”,平均分成,1000,份，表示 这样的（）份。,8,30,137,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,测量活动,（不同单位之间的换算）,我,知道,口答下面的问题,把,1,元平均分成,10,份,每份是几分之几元,?,写成小数是多少元,?,2,元,4,角用,“,元,”,作单位的小数是多少元,?4.5,元是几元几角,?,把,1,元平均分成,100,份,每份是几分之几元,?,写成小数是多少元,?,4,元,2,角,5,分用,“,元,”,作单位的小数是多少元,?0.54,元是几元几角几分,?,1,10,元,0.1,元,2.4,元,4,元,5,角,100,1,元,0.01,元,4.25,元,0,元,4,角,5,分,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,5.63,米,1.8,米,比一比,想一想：,怎样比较两个小数的大小？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,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.,比大小,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.,比大小,1.21,1.23,两个小数比大小，先比整数部分，如果整数部分相同，就从十分位开始顺次比较小数部分。,十,位,个,位,十位,分,百,位,分,千,位,分,十,位,个,位,十,位,分,百,位,分,千,位,分,1.2 1,1.2 3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,谁的得分高？,小强,小刚,陈明,9.87,9.90,9.96,比大小,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 20042011 Aspose Pty Ltd.,比大小,谁的得分高？,小强,小刚,陈明,王平的表现比陈明差一些，比小刚好一些。他可能得多少分呢？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,8,9,10,在上图中找到,9.8,和,10.1,的位置，并比较它们大小。,9.8,10.1,9.8,10.1,Evaluation only.,Created with Aspose.Slides for.NET 35 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,0.7,在 里填数字，使它分别符合下列要求。,（,1,）使这个数最大，这个数是（）。,（,2,）使这个数最接近,31,，这个数是（）。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,0.720,0.702,0.712,请把这些小鱼从小到大的顺序排列起来。,0.720,0.712,0.702,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,根据要求，写出三个小数。,（,1,）在,0.6,和,1.0,之间：（）、,（）、（）。,（,2,）在,0.25,和,0.5,之间：（）、（）、（）。,（,3,）在,0,和,0.1,之间：（）、（）、（）。,每两个小数间有无数个小数。,Evaluation only.,Created with Aspose.Slides for.NET 35 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,下面数中的内可以填几？,0.7,0.6,.2,.,1.,0.1,0.1,在里填上适当的数字。,3.68,3.,8,4.27,4.2,8.75,8.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比大小,我买了一本书，,8,元左右，猜一猜多少钱。谁猜得最接近？,6,7,8,9,7.50,8.30,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,在下图中标出：,0.3,、,1.5,、,2.8,、,3.6,，并写出,A,、,B,、,C,表示的数。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,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.,练习一,判断。,（,1,）小数都比,1,小。（）,（,2,）笑笑的身高是,11.4,米。（）,（,3,）,6.8,里面有,6,个一和,8,个零点一。（4,）,149,厘米比,1.5,米高。（）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,按要求写出,3,个小数。,（,1,）大于,0.2,而小于,0.4,的小数：,（,2,）在,9.9,和,10.1,之间的小数：,（,3,）大于,1,而小于,2,的小数：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,在适当的位置点上小数点，使不等式成立。,987,655,763,993,788,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,用,0,、,8,、,9,、,5,和小数点组成一些小数。,（,1,）组成一个最小的小数,：（）,（,2,）组成一个最大的小数：（）,（,3,）组成与,100,最接近的小数,：（）,（4,）组成与,1,最接近的小数,：（）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习一,猜一猜，括号里可能是几？,0.,6,0.5,9.,9.1,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,2.45,1.21,6,3,2.45,1.21,3.66,（元）,一盒 和一根 ，一共多少钱？,6,（,2.45,）,（,1.21,）,小数点对齐，各个数位上的数分别相加。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,2.45-1.21,-,4,1,2.45,1.21,1.24,（元）,2,（,2.45,）,（,1.21,）,小数点对齐，各个数位上的数分别相减。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,竖式计算不进位、不退位的小数加减法时，小数点一定要对齐，相同的数位要对齐，然后将相同数位上的数相加减，最后不要忘记在得数中点上小数点。,计算小数加减法和整数加减法的区别：整数加减法是从个位加起或减起，而小数加减法是从末尾加起或减起。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,3,0.2,3.22,0.02,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,4.8-2.8,1.3,2.5,3.11,2.22,26.2,13.1,12.3,11.2,35.8,13.3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,同学们进行跳远比赛,.,冬冬跳了,3.16,米,亮亮比冬冬多跳,0.23,米,强强比亮亮少跳,0.18,米,强强跳了多少米,?,亮亮身高,145,米,他站在,0.4,米的凳子上时,比爸爸高,0.05,米,.,爸爸身高多少米,?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,一箱苹果连箱的质量是,51.5,千克，倒出一半后，连箱的质量是,26.5,千克，苹果的质量是多少千克？箱子的质量是多少千克？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,3 6.3,-2.2,1 4.3,正确,:,3 6.3,-2.2,3 4.1,数学医院,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,数学医院,正确,:,1 5.6,+3.2,1 8.8,1 5.6,+3.2,4 7.6,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物小票,（小数的加减法）,在方框里填上适当的数,4.2,.6,7.4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,淘气比丁丁重多少千克？,45.2 33.4,-,8,1 1,45.2,33.4,11.8,（千克）,答：淘气比丁丁重,11.8,千克,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,丁丁比笑笑轻多少千克？,38 33.4=,-,6,4,38,33.4,4.6,（千克）,0,小数末尾填上“,0”,或去掉“,0”,，小数大小不变。,答：丁丁比笑笑轻,4.6,千克。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,智慧锦囊,用竖式计算退位的小数减法，把小数点对齐，从末位减起，如果被减数的小数位数不够，可以在小数末尾添,“,0,”,再减。哪一位上的数不够减，就向它前一位借,1,，在这一位加,10,再减。最后在得数里对齐横线上面的小数点，点上小数点。,小数退位减法,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,计算,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,例,1,一支钢笔的价钱是,12.50,元，一本日记本的价格是,2.95,元。买一支钢笔和一本日记本，一共需要多少元？,12.50,2.95,1 2.5 0,2.9 5,5,4,5,.,1,15.45,（元）,1,答：一共需要,15.45,元。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,小数的进位加法,计算小数的进位加法，把小数点对齐，从末位加起。哪一位上的数相加满,10,，就向它前一位进,1,。最后在得数里对齐横线上面的小数点，点上小数点。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,量体重,（小数的进位、退位加减法）,下面各数中的哪些“,0”,可以去掉？,哪些“,0”,不能去掉？,8.10 15.00 30.070 0.090 600,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.