四年级数学下册第四单元《小数的近似数》练习题(无答案)新人教版.doc

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1求小数的近似数试题一. 填空。(1)1 米 4分米( )分米(2)1.54kg( )g(3)8.54 元( )元( )分(4)1 平方米 20平方分米( )平方分米(5)540 平方厘米( )平方分米( )平方厘米(6)3kg500g( )kg(7)1 千米 500米( )千米二. 用四舍五入法写出下面各数的近似数。保留整数 保留一位小数 保留两位小数3.6479 0.9385 6.4983 5.0306 三. 把下面各数改写成以“亿”或以“万”做单位的数,再保留一位小数。(1)50844( )万( )万(2)694000000( )亿( )亿(3)89940 米( )万米( )万米(4)588000000 吨( )亿吨( )亿吨2

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