第14课时 整理与练习(1)

第14课时 整理与练习(1)
[教学内容]
苏教版义务教育教科书《数学》四年级上册第27~28页整理与练习的“回顾与整理”和“练习与应用”第1~5题。
[教学目标]
1.使学生了解本单元所学的内容,进一步掌握除数是整十数的除法口算,正确掌握除数是两位数的除法笔算方法和相应的验算,能正确笔算得数。
2.使学生通过回顾了解知识之间的联系和解决问题的思考过程,通过练习、比较,进一步理解除法笔算法则,熟练除法笔算计算方法,提高除法笔算能力。
3.使学生逐步形成回顾学习过程的习惯,进一步发展认真计算、追求正确结果的良好习惯。
[教学重点]
除法笔算计算。
[教学准备]
除数是整十数的除法口算卡片。
[教学过程]
一、回顾揭题
1.回顾内容。
引导:最近一段时间,我们学习了两、三位数除以一位数。回忆一下,这一单元都学习了除法的哪些知识,知识之间有哪些联系,同桌先互相说说看。如果有困难,可以把书打开看一看、说一说。
交流:这一单元你认识了关于除法的哪些知识,能举出这些知识的例子,并说一说相互之间的一些联系吗?结合交流说明主要内容及联系,并板书:
除数是整十数的口算(80÷
÷30除数是整十数 除法笔算 除数是两位
简便计算(320÷2.揭示课题。
谈话:这节课我们要进行除法的整理与练习,重点复习两、三位数除以两位数的除法计算。(板书课题)通过整理与练习,要进一步掌握口算和笔算方法,能比较熟练地口算,正确地笔算并能验算。
二、计算复习
(一)口算。
1.做“练习与应用”第1题。
让学生口算写出得数。
交流并呈现得数,选择两道让学生说说算法。
提问:能根据你的计算,说说除数是整十数的除法口算怎样算吗?
指出:这里的口算,都可以看个位0前面的数除,看成两位数除以一位数,按表内除法算出商是几,实际上这是应用了商不变的规律。
2.口算。
用口算卡片让学生直接口算得数。(板书:看成两位数除以一位数口算)
(二)笔算。
1.做“练习与应用”第2题。
(1)做第一组题。
比较:第一组三道题有什么相同和不同的地方?
让学生笔算,指名一人板演,要求计算时注意哪里不同。(学生计算,教师巡视)

先看被除数前两位,不够就看前三位;哪一位不够商1就商0。还要注意每次余数都比除数小。(板书:每次余数比除数小)
[设计说明:复习除法笔算的重要方面是整理和进一步明确方法,而笔算除法的关键是正确求商。这里三组题着重让学生分别感受试商、调商和商0这些“点”,同时通过不同题组商的位数的差异感受商的定位。这样安排,既感受笔算过程,又突出计算关键,有利于学生借助计算由“点”到“法”归纳、整理,进一步掌握法则。这里的复习安排,是根据题组的特点把三组题分开依次练习,使学生经历每组题的计算过程,获得相应“点”的实际感受,进而归纳泫则。具体安排上,第一组要求“计算时注意哪里不同”,交流时着重比较“每题是怎样求商的”,突出试商方法;第二组题计算时要求注意“试商后怎样得到正确的商的”,交流时突出初商出现的问题“怎样解决的”,突出调商方法;第三组要求独立计算、比较,思考“有什么体会想说的”,让学生关注商都是10,个位上商o等,进一步体验方法,交流时提出和前两组商“有什么不同”,对除法笔算“有什么体会”,让学生自己思考、归纳。这就帮助学生进一步加深对这些“点”的感受,促进学生清楚地归纳法则,正确地掌握法则。]
3.按要求完成。
(1)让学生说出下面各题的商各是几位数,说说怎样想的。 32658 32160 38799
(2)学生练习前两题,指名两人板演。
检查计算过程,结合提问第一小题十位上商2可以怎样想,说明可以看“65”里最多2个32,直接商2;提问第二小题怎样求商的,说明不能直接看出商几的可以把除数看作整十数试商。确认计算结果,有错的订正。
说明:求商时,可以用四舍五人法试商、调商,如果能直接看出可以商几,就直接写商。
追问:能直接说出第三小题十位上的商,并说说怎样想的吗?
你认为第四小题的商是几呢?
练习:自己算一算,看看你说的这个商对不对。(学生计算第四小题) 提问:商是几,余数是几?
4.做“练习与应用”第3题。
让学生完成前两题计算,指名两人板演。
检查交流:每一小题怎样算的?怎样验算的?
第二小题商对不对?说说你的验算方法。
三、复习小结
1.课堂小结。
引导:这节课的复习,你主要有哪些收获?还有什么体会?
2.布置作业。
完成“练习与应用”第3题后两小题,第4题、第5题。

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