三年级数学下册第1章采访果蔬会—两、三位数除以一位数(一)第3课时三位数除以一位数课件青岛版六三制.ppt

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三年级数学下册第1章采访果蔬会—两、三位数除以一位数(一)第3课时三位数除以一位数课件青岛版六三制.ppt_第1页
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1、三位数除以一位数,问题:从图中,你知道了哪些数学信息?,4分钟生产果 汁428瓶。,2小时生产果 脯204千克。,4分钟生产果汁428瓶。,2小时生产果脯204千克。,你能提出什么问题?,合作探索,平均每分钟生产多少瓶果汁?,107 (瓶),4284=,4004=100,284=7,100+7=107,2个10不够分怎么办?,4 2 8,4,4个一百平均分成4份,每份是1个一百。,1,4,2,0,0,2,8,7,0,2个十平均分成4份,每份不够1个十怎么办?,把2个十和8个一合起来,平均分成4份,每份是7个一。,合作探索,1,2,0,0,0,4,0,2,4,平均每小时生产多少千克果脯?,204

2、2=,十位上的0除以2,商是0。,102(千克),这样写简便:,合作探索,3分钟生产420瓶 干红葡萄酒。,从图中,你知道了哪些数学信息?,根据这些信息,你能提出什么问题?,3分钟生产420瓶干红葡萄酒。,平均每分钟生产多少瓶干红葡萄酒?,合作探索,4 2 0,3,1,3,1,2,4,0,0,0,0,这个0可以不写吗?,平均每分钟生产多少瓶干红葡萄酒?,140,合作探索,每份是140根,平均每分钟生产多少瓶干红葡萄酒?,3003 = 100,1203 = 40,100+40 = 140,140,合作探索,1.算一算。6 6 0 0 8 9 6 0,1 0 0 6 0,1 2 0 8 1 6 1

3、 6 0,2 3 0 0 7 9 8 0,1 5 0 2 1 0 1 00,1 4 0 7 2 8 2 80,5 4 0 0 3 5 1 0,8 04 0 0,1 7 0 3 2 1 2 10,2.填一填。,2,0,3.用竖式计算下面各题,带“”的题目要求验算。 6923 8416,2302,1401,2834 8535,703,1703,3213 = 107(个),6606 = 110 (个),答:王红每分钟拍107个,李军每分钟拍110个。,4.,归纳总结:,三位数除以一位数(商中间有0)的笔算方法: 按照三位数除以一位数的方法计算,被除数的百位正好能除尽,除到被除数的十位不够商1,就在商的十位上写0,再把被除数个位上的数落下来与十位上的余数合起来继续除;如果被除数十位上的数是0,就直接在商的十位上写0。,笔算除法有妙招, 除中遇到不够除, 商0占位不含糊, 后落一位接着除。,课本第11页自主练习第1,2,3题。,xx小学 x年级x班,xxx,

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