北师大小学数学四年级下册练习四的.ppt
,北师大版四年级下练习四,新民小学,0.12,0.9,0.16,0.05,12,0.9,0.45,0.08,25,10,4,(),().,按照规律填数,规律:依次乘0.4或依次除以2.5,1.6,0.64,1.81.31.2,2列竖式计算,并且验算。42.77=82.51525.218 0.2357.875 0.44832,6.1,=5.5,=1.4,=0.046,=0.104,=0.014,21.71000=21700(米),请你提出两个数学问题,并解答。问题一:问题二:,平均编一个大“中国结”用彩带多少米?,5.24=1.3(米)答:用彩带1.3米。,平均编一个小“中国结”用彩带多少米?,8.1612=0.68(米)答:用彩带0.68米。,脱式计算。,9脱式计算。,=5410.8=5,=3.320.8=4.15,=0.74=2.8,=0.175(0.250.4)=0.1750.1=1.75,128.892=1.4(元),1.41.3 答:选用信达公司的比较合算。,答:需要篱笆92米。,