《两位数加两位数(进位)》教学设计.pdf

二年级上两位数加两位数(进位加）教案设计教学内容：新课标人教版二年级上册第11 页例 3，“做一做”及练习二36 题。教学目标：1.知识与技能(1).初步理解掌握笔算两位数进位加法的计算方法，能正确地计算两位数的进位加法。(2).初步培养学生的分析概括能力。2.过程与方法经历两位数加两位数（进位加）的计算方法的形成过程，体验由具体到抽象的数学思想和方法。3.情感态度与价值观在解决实际问题的同时学习数学，让学生感悟学习数学的价值，培养学生的数学情感。教学重、难点：重点：比较熟练地计算两位数加两位数的进位加法，体验算法的多样化。难点：使学生理解并掌握进位的方法。教具、学具以及课件准备：课件、小棒、课本8 页主题图，例 3 主题图教学方法：教法：谈话、指导相结合法学法：自主探究法教学过程设计：一.创设情境，生成问题。(出示第 8 页主题图)二年级四个班的同学们准备去参观博物馆，每辆车准成 70 人。师：下面发生了一件事，你们能帮忙解决吗？仔细看！（出示 11 页例 3 的二（1）班和二（3）班的乘车图）师:你知道发生了什么事吗？你能提出什么数学问题？生：二（1）班和二（3）班想合乘一辆车，能坐下吗？师：怎么算？生独立思考并列式36+35=（板书算式）（设计意图：通过观察情境图，从而使学生自己发现问题，激发解决问题的兴趣。）二、探索交流，解决问题。1、先用小棒摆一摆。师：在 36 根小棒下面放 35 根小棒怎么放？生：上面 10 根一捆，3 捆再有 6 根，下面 10 根一捆，3 捆再有 5 根。（学生自己动手操作摆好小棒）师：将两组小棒加起来，应先加什么？生：6 根和 5 根先相加是 11 根。师：11 根小棒能捆成一捆吗?（能）怎么放?（1）独立思考。文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4（2）小组交流并汇报结果。生：把 11 根小棒其中的 10 根捆起来（边说边放），把这 1 捆放在整捆处。师：结果怎样？生：上面的 3 捆加下面的 3 捆是 6 捆，再加上刚才新捆的1 捆就是 7捆。和剩下的一捆合在一起是71 根小棒。（多找几名同学边说边摆，说过程）2.用竖式算一算。师：把刚才的动作（放在整捆处的1 捆）在竖式上该怎么写？（1）学生根据摆小棒的过程，尝试列出竖式。（2）组织学生交流讨论:个位上 6 加 5 得 11，如何向十位进“1”？个位上怎样写?(演示从“小棒图”过渡到下面的竖式图。)3.讨论算法。师：你发现今天我们学习的竖式计算与上节课有什么不同的地方？（巩固个位上相加满十向十位进“1”的概念）(板书课题)引导学生说出笔算两位数加法要注意哪三条。（相同数位对齐，从个位加起，个位相加满十向十位进“1”。）师：请大家翻到课本 12 页，看看你总结的和课本上的是否一样。（指导学生看课本）（设计意图：通过动手摆小棒，形象地在脑中建构竖式的形成过程，以“动作”为出发点把小棒十根一捆放在整捆处内化到竖式中个位相加满十向十位进“1”的概念更形象，便于理解掌握。）文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4三、巩固应用，内化提高1、完成课本 11 页下面的“做一做”。两名同学上台板演，集体订正时，要求说出“想”的过程。2、完成练习二中的36 题。3、课本 12 页下面的做一做。师：小红跟爸爸去海洋馆玩。你们从图中能获得哪些信息？能解决提出的问题吗？4、完成课本 12 页“做一做”下面的思考题。教师要结合实例说明题意，然后让学生独立思考，关键是先找到一个两位数，使它的个位和十位上的数字相加得9。然后再把这个两位数的十位、个位交换位置就得到另一个符合条件的两位数。（设计意图：数学来源于生活应用于生活，这一环节是让学生展示自己的所学，让学生有一种成就感。同时让学生通过解决生活中的问题，感悟学习数学的价值，培养了学生的数学情感。）四、回顾整理，反思提升。今天我们学习了什么？你有什么收获呢？教后反思：这节课教学两位数加两位数的进位，从学生感兴趣的话题入手，创设一定的生活情境，在教学时充分利用小棒等直观教具帮助学生理解算理，特别是这节课的重难点处，进位1 的处理，为了让学生不遗漏，在加十位时先用进过来的小1 加，上课时课堂氛围很好，学生学习积极性高，说计算方法时也很熟练。但写课堂作业时，却出现了不少的文档编码:CR8D4J4R5S10 HV2S2H1V7I10 ZN6M6J10O1U4文档编码:CR8D4J4R5S10 HV2S2H1V7I10 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