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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,*,近 似 数,苏教版小学数学第七册,执教：黄为民,你知道上面的哪些数是近似数？,480556,482139,480782,483614,484058,480000,480000,480000,480000,480000,0,0,2,4,3,483999,485999,480000,490000,3,5,48,万,49,万,48 999,48 999,48 999,48 999,48 999,480000,480000,480000,480000,480000,1,2,3,4,0,48 999,48 999,48 999,48 999,48 999,490000,490000,490000,490000,490000,9,8,7,6,5,48,0,999 480000,48,1,999 480000,48,6,999 490000,48,2,999 480000,48,3,999 480000,48,4,999 480000,48,5,999 490000,48,7,999 490000,48,8,999 490000,48,9,999 490000,1,0,3,2,5,4,6,9,8,7,思考：,（,1,）“尾数”指的是哪里的数？,（,2,）“四舍五入”关键看哪一位上的数？,（,3,）“四舍五入”后，尾数怎么办？,700,2000,400,10000,3000,28,20,6,9,8,7,5,4,3,2,1,课后作业：,谢谢指导！,
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