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,*,小数的性质,单价相等吗?为什么?,华美超市,好佳超市,0.3,元,0.30,元,0.30,0.3,说一说,牛奶,2.80,元,面包,4.00,元,汽水,3.05,元,火腿肠,0.65,元,合计,10.50,元,左边价格表上的哪些“,0”,可以去掉?,练一练,下面数中的哪些“,0”,可以去掉?哪些“,0”,不可以去掉?为什么?,1.80 0.250 4.070 703.050,60.0 0.060 300 80.040,试一试,不改变数的大小,把下面各数改写成三位小数,0.4=,3.16=,10=,0.4,00,3.16,0,10,.000,判断下面几题,哪些符合小数的性质。,0.2=0.200 (),0.0010=0.1 (),7.800=7.8 (),13.5=13.500 (),3.2=3.02 (),43.505=43.55(),5.60=5.6 (),12.000=12 (),10000=1 (),9=9.00 (),0.2=0.200,7.800=7.8,13.5=13.500,5.60=5.6,12.000=12,9=9.00,7.800=7.8,5.60=5.6,12.000=12,0.2=0.200,13.5=13.500,9=9.00,化简,改写,0.400=0.080=1.750=29.00=10.830=80.040=20.10=0.0350=,化简下面的小数。,0.4,0.08,1.75,29,10.83,80.04,20.1,0.035,把下面各数改写成三位小数。,0.5400=,30.6=,80=,1.02000=,0.5040=,3.60=,1.20=,8.0=,0.540,30.600,80.000,1.020,0.504,3.600,1.200,8.000,60.0=,60.000,0.0600=,0.060,2.50,元,1.50,元,1.08,元,0.50,元,1.00,元,超市新进一批冷饮,你能帮经理设计一下价格标签吗?,(,用“元”作单位,改写成两位小数),设计标签,可爱多,随便,青,苹果,盐水棒冰,绿豆棒冰,2元5角,1,元,5,角,1,元零,8,分,5角,1,元,想一想,这节课我们共同研究了什么?,小数的性质有何用处?,露一手,智力冲浪,连连看,把,相等的数用线连起来,。,4.30,0.018,7.203,0.090,7.2030,0.09,4.300,0.180,找朋友:,说出与下面的数不同但大小相等的数,。,5.8,73,摆数游戏,用五张数字卡片,按要求摆数,。,1,、这个数里的两个,0,都能去掉,但数的大小不变。,2,、这个数里的两个,0,一个能去掉,一个不能去掉,但数的大小不变。,3,5,0,0,.,谁长得最高,0.1,米,0.10,米,0.100,米,米,米,米,1,分米,10,厘米,100,毫米,