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,*,小数的产生和意义,峄山镇中心小学 陈开运,人教版四年级下册,把,1,米平均分成,10,份,。,1,分米,1,10,米,0.1,米,分米,米,米,分米,米,米,4,4,10,0.4,7,7,10,0.7,一位小数,1,2,8,9,10,7,6,5,4,3,1,米,10,20,30,40,50,60,70,80,90,1,米,1,2,3,9,10,5,4,6,7,8,把,1,米平均分成,100,份。,1,厘米,1,100,米,0.01,米,厘米,米,米,厘米,米,米,4,100,6,100,0.04,0.06,4,6,两位小数,1,厘米,把,1,米平均分成,1000,份。,1,1000,米,0.001,米,米,米,米,米,1,毫米,6,1000,0.006,13,1000,0.013,三位小数,1,10,3,10,7,10,0.1,0.3,0.7,一位小数,100,1,100,3,100,6,0.01 0.03 0.06,两位小数,1000,1,1000,6,1000,13,0.001 0.006 0.013,三位小数,1,10,3,10,7,10,0.1,0.3,0.7,一位小数,100,1,100,3,100,6,0.01 0.03 0.06,两位小数,1000,1,1000,6,1000,13,0.001 0.006 0.013,三位小数,十分之几是一位小数，百分之几是两位小数，千分之几是三位小数。,1,10,3,10,7,10,0.1,0.3,0.7,一位小数,100,1,100,3,100,6,0.01 0.03 0.06,两位小数,1000,1,1000,6,1000,13,0.001 0.006 0.013,三位小数,分母是,10,、,100,、,1000,的分数可以用小数表示,分数：,小数：,6,10,7,10,32,100,0.6,0.7,0.32,填一填,0.3,里面有（）个,0.5,里面有（）个,1,10,1,10,十分之一,3,5,写作：,0.1,一位小数的计数单位是,填一填,0.07,里面有（）个,0.09,里面有（）个,1,100,1,100,两位小数的计数单位是,百分之一,写作：,0.01,7,9,0.07,里面有（,7,）个,0.09,里面有（,9,）个,1,100,1,100,0.3,里面有（,3,）个,0.5,里面有（,5,）个,1,10,1,10,小数的计数单位,是十分之一、百分之一、千分之一,分别写作,0.1,、,0.01,、,0.001,做一做,0.8,里面有（）,0.1,。,0.32,里面有（）,0.01,。,0.049,里面有（）,0.001,。,填一填,2,、,0.06,的计数单位是,(),，有,6,个（）。,3,、,0.034,的计数单位是,(),，有（）,个,(),。,1,、,0.8,的计数单位是,(),，里面有,(),个 。,1,10,1,10,1,100,1,100,1,1000,34,1,1000,8,0.1,米里面有（）个,0.01,米,0.01,米里面有（）个,0.001,米,0.1,0.01,(),0.001,(),10,10,10,10,每,相邻,两个计数单位之间的进率是,10,2,、哪两只手套是一副？用线连一连、,100,36,0.87,0.6,0.25,100,15,1000,48,1,、,1,毫米用米作单位写成小数是,0.01,米。,2,、,10,个,0.01,是,0.1,。,3,、,0.32,里面有,32,个,0.1,。,判断,（）,（）,（）,在进行测量和计算时，往往不能正好得到整数的结果，这时常用,小数,来表示。,把整数,1,平均分成,10,份、,100,份、,1000,份,这样的一份或几份是十分之几，百分之几、千分之几,写成不带分母的形式的数，叫,小数。,小 结,小 结,小数的计数单位,是十分之一、百分之一、千分之一,分别写作,0.1,、,0.01,、,0.001,十分之几是一位小数，百分之几是两位小数，千分之几是三位小数。,小数中，每相邻两个计数单位间的,进率是,10,。,