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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,*,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,*,整十、整百数乘一位数的口算练习,实验一小 罗 阳,西师版数学三(上),复习,1.,口算。,5,3,(),4,7,(),5,8,(),6,8,(),7,9,(),9,6,(),7,3,(),2,5,(),15,28,40,48,63,54,21,10,8,4,(),32,7,3,(),21,8,7,(),3,8,(),56,24,()()(),()()(),2.,口答。,复习,(,1,),80,是几个十?,300,是几个百?,900,是几个百?,8,个十,20,3,个百,9,个百,150,(,2,),2,个十是多少?,15,个十是多少?,35,个百是多少?,3500,()(),()(),(,3,),4,个十乘,8,得几个十?,是多少?,(,4,),7,个百乘,6,得几个百?,是多少?,32,个十,32,0,42,个百,42,00,9,0,2=,想:,9,个十,乘,2,得,18,个十,18,0,8,00,3=,想:,8,个百,乘,3,得,24,个百,24,00,7,0,6,=,想:,7,个十,乘,6,得,42,个十,42,0,复习,3.,计算,说出口算的思路过程。,8,6,00,=,想:,6,个百,乘,8,得,48,个百,48,00,1,00,7=,想:,1,个百,乘,7,得,7,个百,7,00,8,4,0,=,想:,4,个十,乘,8,得,32,个十,32,0,4,00,2=,想:,4,个百,乘,2,得,8,个百,8,00,复习,3.,计算,说出口算的思路过程。,3,0,9,=,想:,3,个十,乘,9,得,27,个十,27,0,5,0,6=,想:,5,个十,乘,6,得,30,个十,30,0,3,00,6=,想:,3,个百,乘,6,得,18,个百,18,00,5,6,00,=,想:,6,个百,乘,5,得,30,个百,30,00,复习,3.,计算,说出口算的思路过程。,4,00,8,=,想:,4,个百,乘,8,得,32,个百,32,00,3,7,00,=,想:,7,个百,乘,3,得,21,个百,21,00,9,00,7=,想:,9,个百,乘,7,得,63,个百,63,00,6,0,8,=,想:,6,个十,乘,8,得,48,个十,48,0,复习,3.,计算,说出口算的思路过程。,75,00,=,想:,5,个百,乘,7,得,35,个百,35,00,1.30,是,(),个十,;3,个十乘,4,得,(),个十,就是,(),。,2.500,是,(),个百,;5,个百乘,6,得,(),个百,就是,(),。,3.,表示,6,个,80,的算式是(),结果是()。,4.,计算,200,8,时,想:,2,乘以,8,得,16,,末尾添写()个,0,,所以积是()。,3,练一练,一、填空。,12,120,5,30,3000,806,480,2,1600,40,8,3004,509,3001,30,17,4005,25,6,850,500,7007,700,6,9004,970,4600,2400,330,320,练一练,二、口算。,1200,450,300,13,2000,19,400,0,4900,706,3600,630,2400,800,900,1.30,3,900.(),2.4,个,70,相加与,70,个,4,相加得数不同。,(),3.600,3,就是,6,个百,3,18,个百,1800.,(),4.,“,900,4”,可先用,9,乘,4,得,36,,再在末尾补上两个,0,得,3600.,(),练一练,三、判断。,50,5,800,1000,700,700,3007,2500,1008,2100,7001 300,练一练,四、连线。,1.50,乘,7,得多少?,2.5,个,800,是多少?,3.600,的,3,倍是多少?,4.8,和,400,相乘,积是多少?,50,7,练一练,五、口答。,350,800,5,4000,600,3,1800,8,400,3200,1,.,蔬菜店卖出花菜,600,千克,卖出白菜的重量是花菜的,5,倍。卖出白菜多少千克?,600,5,练一练,六、应用题。,3000,(,kg,),答:卖出白菜,3000千克,。,2.,小红步行,每分钟走,80,米,,3,分钟可以走多少米?,5,分钟呢?,80,3,练一练,六、应用题。,240,(,m,),答:,3,分钟走,240m,,,5,分钟走,400m,。,80,5,400,(,m,),3.,妈妈要买,20,千克大米,每千克大米,4,元钱,妈妈带,110,元钱够买吗?,20,4,练一练,六、应用题。,80,(元),答:妈妈带,110,元钱够买。,110,80,你真棒,再见!,
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