516整理与练习.pptx

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,#,苏教版小学数学五年级上册,整理与练习,绿色圃中小学教育网,www.L,绿色圃小学教育网,www.L,绿色圃中学资源网,cz.L,回顾与整理,小数乘、除法的计算与整数乘、除法有,什么联系？,计算小数乘法时，怎样确定积的小数位,数？,怎样把除数是小数的除法转化成除数是,整数的除法？,练习与应用,1,直接写出的数。,3.42,6.8,40.5,2,0.639,0.07,3.50.7,5,0.70.8,0.56,0.250.05,5,练习与应用,2,算一算，比一比。,8.67,60.2,8.60.7,6.02,0.860.7,0.602,11.736,0.325,11.73.6,32.5,11.70.36,3.25,练习与应用,3,用竖式计算，并用计算器验算。,1.33.8,4.94,2.90.82,2.378,0.0720.15,0.0108,2.0424,0.085,0.7560.18,4.2,0.2560.032,8,练习与应用,4,计算下面各题，得数保留两位小数。,0.172.45,0.42,2.60.54,1.40,7.313,0.56,7.832.8,2.80,绿色圃小学教育网,www.L,绿色圃中学资源网,cz.L,练习与应用,5,人的嗅觉细胞大约有,0.048,亿个，狗的嗅觉细胞大约是人的,45,倍。狗的嗅觉细胞大约有多少亿个？,（得数保留一位小数）,0.04845,2.2,（亿个）,答：狗的嗅觉细胞大约有,2.2,亿个。,练习与应用,6,（,1,）一种奶油蛋糕做,1,个要用,7.5,克奶油。,50,克奶油最多可以做多少个这种蛋糕？,507.5,6,（个）,答：,50,克奶油最多可以做,6,个这种蛋糕。,绿色圃小学教育网,www.L,绿色圃中学资源网,cz.L,练习与应用,6,（,2,）幼儿园买,50,个奶油蛋糕，每,8,个装一盒，至少要用多少个包装盒？,508,7,（个）,答：至少要用,7,个包装盒。,练习与应用,7,小明家七月份用水,12.4,吨，八月份用水,13.6,吨，九月份用水,11.7,吨。他家这三个月平均每月用水多少吨？,（得数保留整数）,答：他家这三个月平均每月用水,13,吨。,（,12.4,13.6,11.7,）,3,37.73,13,（吨）,练习与应用,8,先算一算，再比较每组题的得数，你有什么发现？,4.80.1,48,4.810,48,2.60.5,1.3,2.62,1.3,1.50.25,6,1.54,6,5.40.1,0.54,3.60.5,7.2,80.25,2,5.410,0.54,3.62,7.2,84,2,练习与应用,9,不计算，在里填“”“”或“”。,0.10.1,0.10.1,0.30.15,0.30.15,99.90.1,0.9990.1,3.22,3.22,练习与应用,10,计算下面各题，注意使用简便算法。,4,（,9.3,5.7,）,3.6,0.6799,0.67,43.6,3.6,3.65,0.67,（,99,1,）,0.67100,67,18,练习与应用,10,计算下面各题，注意使用简便算法。,4.252.5101,1.7,6.8,1.256.88,1.7101,1.7,1.7,（,101,1,）,6.8,1.2586.8,6.8,106.8,74.8,170,练习与应用,11,用计算器算出下面每种食品,1,千克各是多少元？,20,元,63.75,元,42.5,元,26.8,元,练习与应用,12,李晓芳用彩纸制作了一条花边，一共排列了,8,朵花。每朵花的宽是,4.5,厘米，每相邻两朵花之间的距离是,1.2,厘米。你能算出这条花边一共长多少厘米吗？,4.58,1.27,36,8.4,44.4,（厘米）,答：这条花边一共长,44.4,厘米。,探索与实践,13,用计算器计算每组前三题，发现规律后直接写出后两题的得数。,0.40.9,0.440.99,0.4440.999,0.44440.9999,0.444440.99999,0.36,0.4356,0.443556,0.44435556,0.4444355556,探索与实践,13,用计算器计算每组前三题，发现规律后直接写出后两题的得数。,0.60.9,0.660.99,0.6660.999,0.66660.9999,0.666660.99999,0.54,0.6534,0.665334,0.66653334,0.6666533334,探索与实践,14,了解你家上月用电的数量和每千瓦,时电的价格，算出上个月一共应付电费多少元？,