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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,*,小数的意义和读写,苏教版小学数学五年级上册,2014.9,修改版,米,分米,厘米,毫米,10,10,10,100,1000,元,角,分,10,10,100,复习,10,1,0.1,10,3,0.3,4,厘米、,12,厘米各是,1,米的几分之几?各是几分之几米?,100,7,0.07,100,11,0.11,1,毫米等于几分之几米?,40,毫米、,105,毫米呢?你是怎样想的?,练一练,1000,3,0.003,1000,86,0.086,1000,160,0.160,0.04米,0.015米,0.3元,比较上面每组中的分数和小数,你能发现什么?想一想,还有没有位数更多的小数?在小组里进行交流。,米,10,3,米,4,100,元,1,5,1000,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,100,1,0.01,100,5,0.05,100,73,0.73,分数:,小数:,分数:,小数:,分数:,小数:,下面每个图形都表示整数,“,1,”,,把图中涂色的部分分别用分数和小数表示出来,0.7,0.43,0.009,一个小数的小数部分含有几个数位,这个小数就是几位小数。,如0.3是一位小数,0.04是两位小数,0.007是三位小数。,显然,还有小数位数更多的小数。,读出下面各数,并说出各表示几分之几。,0.39,0.108,0.006,0.5,0.80,100,39,1000,108,1000,6,10,5,100,80,10,3,2,100,21,1000,10,8,(),37,100,256,1000,(),(),(),(),(),在括号里填上合适的小数。,0.3,0.256,0.021,0.8,0.37,0.02,通过本节课的学习,你有什么收获?还有什么问题?,课堂小结,
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