100以内数的加减法(二)复习课教案设计.pdf

100 以内数的加减法复习课教学设计新华第六小学卢艳清教学内容：教科书 100 页总复习“成长小档案”第三幅图，第101页第 1 题，练习二十五第 1、2 题。教学目标：1、引导学生主动回忆100以内数加减法的计算知识，能正确熟练的进行计算。进一步提高学生的计算能力。2、在小组的交流与合作学习中，培养初步的归纳总结数学知识的能力。3、通过整理和复习，让学生能发现计算中存在的一些规律，体验数学学习的乐趣。教学重点、难点：1、正确、熟练地计算。2、让学生形成初步的整理知识的能力，熟练掌握正确的计算方法并能发现规律。教学过程：一、复习导入（师：同学们，到现在为止，我们已经把二年级上册这本书学完了。我们一起来到知识岛回顾一下我们这学期学过的知识（课件），你们学会了那么多的知识，你们高兴吗？今天老师就先带领你们来到“百以内的加减法”这一站进行复习（板书课题）。你们能做到积极动脑筋，回答问题吗？好，请看屏幕。）1、比一比，看谁是计算小能手。（课件）263=2320=2619=5230=247=1428=7256=9135=2、谁来说说“263 5230”是怎样算的。这些算式【设计意图】复习口算，为新课教学做好准备。二、计算的梳理、归纳1、师：屏幕上做过的这8 道题，都是我们学过的100 以内的加法和减法。你们能把这些加减法算式再分类分细点吗？师生一起小结，整理学生的分类，并板书。不进位加不退位减加法 减法（连加、连减、加减混合）进位加退位减教师：在这 8 道题中，你认为哪几道题难度大些，容易出错？学生发表看法。教师：像这样不止一位数又需要进位和退位的计算题，我们可以有竖式来帮助计算。现在我们一起来回忆一下笔算加法和减法要注意些什么？（课件）2、老师提供有趣的分类图（练习纸），让学生按要求自编算式，并在小组内完成竖式计算，最后进行小结。学生以小组为单位进行编题，合作前提好要求：先独立按要求编题，然后在小组内交换用竖式计算，最后进行小结。小组汇报交流，教师投影展示（小组长推荐）学生不同的竖式计算题，让其他学生评价。3、计算方法的再呈现和梳理。文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 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HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3一起说说笔算两位数加、减法应注意什么？（课件呈现）4、连加、连减以及加减混合知识梳理。（课件）师：请同学们翻开练习纸的背面，这些是什么算式？呈现连加、连减、加减混合并板书。（1）想想计算时先算什么，再算什么，然后用竖式计算。（2）（课件）出示答案，自己打分。显示部分同学不同的竖式方法，进行比较。小结：连加、连减、加减混合一般都是从左往右计算，遇上小括号的，要先算小括号里的算式。【设计意图】让学生自主整理知识点，小组进行交流。体现了“知识让学生梳理；规律让学生寻找。”的特点，在体验学习成功的同时发展思维的灵敏性，培养学习的自信心，为学生日后的自主学习打下基础。三、综合练习1、森林小医生。（师：森林里一些树木生病了，因为他们身上的算式出错了。你能像啄木鸟医生那样给我们的小树治病吗？请在卷子后面重新列算式改正。）2、数学小诊所。（开来小朋友们都是能治病的小医生，我们继续来到数学小诊所，抢答这道题病的原因。加20 分）3、后面藏着的数字是几？（有几只可爱的小兔子看到小朋友们这么认真的开动脑筋，也过来考考你们了。他们特意把算式中的一些文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 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HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3数挡住了，）你们能猜出后面藏着的数字是几吗？）小组讨论，并推荐一个同学来回答。【设计意图】利用多种形式的练习，巩固学生对100以内的笔算加、减法的掌握，培养学生认真读题，积极动脑筋，细心计算的良好习惯。四、评价反思，全课总结教师：这节课，我们一起对学过的“100以内的加法和减法”的知识进行了整理和复习，你有什么收获吗？教师板书：相同数位对齐；从个位算起；笔算加法时，个位相加满十，向十位进1；笔算减法时，个位不够减，从十位退1 当十再减。小结：通过这节课的复习，相信同学们的计算会更熟练。在计算时只要认真审题，看清运算符合，就能算得准确。【设计意图】总结计算方法，梳理学生的知识体系，提醒学生计算时要认真审题。五、课堂作业教材第 101 页第 1、2 题。（1 号本独立完成）板书设计总复习 100 以内的加法和减法（计算）不进位加不退位减加法 减法 连加、连减、加减混合文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 ZG1E7Q9M4S3文档编码:CW3Y2N10R1J7 HE4R10U9Y1Z7 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