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西师大版四年级数学下册,0.1,0.5,0.1,0.3,0.3,元,元,0.3,0.1,0.7,7,把1m平均分成1000份，其中1份是1mm。,1mm =( )m=( )m,146mm = ( ) m=( )m,0.001,0.146,千分之几,0.001,0.001 0.146,0.001,0.025,0.107,有（ ）个0.001,有（ ）个0.001,107,25,你发现了什么,一位小数表示十分之几，计数单位是0.1。,两位小数表示百分之几，计数单位是0.01。,三位小数表示千分之几，计数单位是0.001。, ,