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,4.,包装,【,对点训练,】,1.,列竖式计算。,(1)9.8,5.2 0.32,0.4 5.6,0.3,=50.96,=0.128,=1.68,(2)4.8,3.25 0.6,0.45 3.42,0.5,=15.6,=0.27,=1.71,(3)0.8,0.05 0.12,0.05 1.002,0.005,=0.04,=0.006,=0.00501,教材练一练,P41 T5,妈妈想买,3.8,千克香蕉，,25,元够吗？,【,示范解答,】,5.90,3.8=22.42(,元,)22.42,元,25,元 答：,25,元够。,运用类推法巧解题,计算：,【,示范解答,】,【,对点训练,】,2.,计算。,【,基础题,】,1.,看谁算得又对又快。,0.12,6=30,0.4=0.25,4=,0.9,0.8=2.1,0.7=2.5,0.4=,0.72,12,1,0.72,1.47,1,2.,给下面各式的积补上小数点，并相应添上或去掉,“,0,”,。,0.0,.,3.,选一选。,(,把正确答案的选项填在括号里,),(1),根据,2.6,180=468,，积是,4.68,的算式是,(),。,A.2.6,1.8 B.26,1.8 C.0.26,1.8,(2),下面各题的积最大的是,(),。,A.32,0.26 B.3.2,0.26 C.0.0032,260,A,A,4.,错题回收站。,5.,列竖式计算并验算下面各题。,8.65,2.8 0.56,0.14,=24.22,=0.0784,3.14,0.08 3.8,0.25,=0.2512,=0.95,【,能力题,】,6.,在,里填上,“,”,或,“,”,。,7.,马的奔跑速度是,40.5,千米,/,时。,(1),鸵鸟的奔跑速度是多少千米,/,时？,40.5,1.62=65.61(,千米,/,时,),答：鸵鸟的奔跑速度是,65.61,千米,/,时。,(2),猎豹的奔跑速度是多少千米,/,时？,40.5,2.9=117.45(,千米,/,时,),答：猎豹的奔跑速度是,117.45,千米,/,时。,8.,你知道军军学校花园的长是多少吗？,13.8,1.5=20.7(m),答：军军学校花园的长是,20.7m,。,9.,给一个长,2.4m,，宽,0.8m,的长方形宣传栏刷油漆，每平方米要用油漆,0.9kg,。一共需要多少千克油漆？,2.4,0.8=1.92(m,2,),1.92,0.9=1.728(kg),答：一共需要,1.728kg,油漆。,【,探究题,】,10.,将下面算式补充完整。,3,8,5,8,0,3,0,0,8,9,6,
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