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,*,温故知新,口算,4,2=,5,3=,6,7=,40,2=,50,3=,60,7=,8,80,15,150,42,420,8,2=,4,15,3=,42,7=,5,6,8,4=,2,15,5=,3,42,6=,7,填一填,40,里面有()个十。,80,里面有()个十。,()个十组成,120,。,260,是由()个十组成的。,300,里面有()个百。,4,8,12,26,3,整十、整百数除以一位数的口算,单击页面即可演示,把,60,支铅笔平均分给,3,个班。,每班分得多少支?,60,3=,(),你想怎样计算?和同学交流。,60,3=,(),3,个,20,是,60,,,60,除以,3,等于,20,。,6,个十除以,3,得,2,个十,是,20,。,6,3=2,60,3=20,答:每班分得 支。,20,支,20,试一试,600,3=,200,想:,6,3=2,600,3=200,想:,6,个百除以,3,等于,2,个百,是,200,。,把,120,支铅笔平均分给,3,个班,每班分得多少支?,和同学说说你的计算方法。,把,120,看作,12,个十,,12,个十除以,3,得,4,个十,是,40,。,12,3=4,120,3=40,120,3=,(),答:每班分得 支。,40,支,40,想想做做,1.,(,1,),6,2=,60,2=,600,2=,8,4=,80,4=,800,4=,9,3=,90,3=,900,3=,3,30,300,200,20,2,3,30,300,6000,2=,3000,想想做做,1.,(,2,),27,3=,270,3=,30,6=,300,6=,45,5=,450,5=,9,90,9,90,5,50,2.,口算下面各题。,400,2=,400,4=,800,2=,210,7=,240,6=,560,8=,200,4=,300,5=,900,9=,200,100,400,30,40,70,50,60,100,3.,80,2,720,9,150,3,400,5,200,5,350,7,50,80,40,大米,20,千克,小米,2,千克,4.,大米的千克数是小米的多少倍?,20,2=10,答:大米的千克数是小米的,10,倍。,5.40,个同学打乒乓球。,都参加单打,可以分成多少组?都参加双打呢?,单打:,双打:,40,2=20,(组),答:可以分成,20,组。,40,4=10,(组),答:可以分成,10,组。,6.,右边的长方形表示,120,,涂色部分,表示多少?,120,6=20,答:涂色部分表示,20,。,
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