2022年《加法运算定律》教学设计2 .pdf

学习好资料欢迎下载加法运算定律教学设计学习内容：人教版小学数学教材四年级下册第1719页例1、例2及相关内容。学习目标：1通过尝试解决实际问题，观察、比较，发现并概括加法交换律、加法结合律。2初步学习用加法运算定律进行简便计算和解决实际问题，培养简便计算意识，提高解决实际问题的能力。3通过观察算式并归纳抽象运算定律，发展学生的观察、概括能力和语言表达能力。学习重点：掌握加法交换律和加法结合律。学习难点：理解加法运算定律。学习准备：课件等。学习过程：环节预设教师活动学生活动设计意图一、情境导入1谈话引入，呈现问题师：骑车是一项有益健康的运动，这不，这里李叔叔正在骑车旅行呢！（多媒体演示：李叔叔骑车旅行的场景。）2获得信息问：从中你可以得到哪些信息？学生同桌交流，然后全班汇报。随着学生的回答，多媒体从左往右展示线段图，出现大括号与问题：3解决问题问：能列式计算解决这个问题吗？（学生自己列式并口答。）学生思考出 示 情境图，让学生自由发散思维，提出问题。学习好资料欢迎下载二、合作探究1加法交换律（1）解决例 1 的问题。根据学生回答板书：405696（km）请学生说说思路，并用多媒体演示过程，线段图：从左往右呈现。564096（km）请学生说说思路，同样用多媒体展示：从右往左再现线段图。问：两个算式都表示什么？得数怎样？里填什么符号？405656 40（2）你能照样子再举出几个这样的例子吗？（3）从这些例子可以得出什么规律？请用最简洁的话概括出来。（4）反馈交流后得到：两个加数交换位置，和不变。（5）揭示定律。问：知道这条规律叫什么吗？把加数换成其他任意的数，交换律还成立吗？怎样表示任意两数相加，交换加数位置和不变呢？请你用自己喜欢的方式来表示，好吗？交流反馈，然后看书：看看课本上的小朋友是怎么说的。（6）根据加法交换律对口令。师:25 65_ 7864_（7）完成教科书第 18 页“做一做”第 1 题。2加法结合律学生讨论交流并回答问题。结合具体情境，通过尝试解决实际问题，观察、比较，发现并概括加法交换律、加法结合律，培养简便计算意识，提高解决实际问题的能力，发展学生的观察、概括能力和语言表达能力。文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1学习好资料欢迎下载多媒体展示：李叔叔三天骑车的路程统计。（1）找出信息解决问题。问：你能解决李叔叔提出的问题吗？学生独立完成后交流。多媒体展示线段图：根据学生列出的不同算式，表示三天路程的线段先后出现。三天一共骑了多少千米？问：通过线段图的演示，你们发现了什么？（不论哪两天的路程先相加，总长度不变。）我们来研究把三天所行路程依次连加的算式，可以怎样计算：师：为什么要先算10496 呢？（后两个加数先相加，正好能凑成整百数。）出示：（88104）9688（10496）。师：怎么填？（2）你能再举几个这样的例子吗？问：观察、比较这些算式，说一说你发现了什么秘密？（鼓励学生用自己的话来说。）（3）揭示规律：三个数相加，先把前两个数相加，或者先把后两个数相加，和不变，这就是加法结合律。（4）用符号表示。（学生独立完成，集体核对。）（）_（_）；（ab）c_（_ _）文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 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ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1学习好资料欢迎下载（5）问：用语言表达与用字母表示，哪一种更一目了然？这里的 a、b、c 可以表示哪些数？三、巩固应用1指出下面各题分别运用了什么加法运算定律。（2）用“凑十法”算 796（19）。（运用了加法结合律）（3）（6）为教科书第 19 页练习五第 1 题（略）。2连一连。83315 64（7337）874258 31583（6473）37 87（4258）567844 78（5644）想一想：最后一组连线的依据是什么？学生进行思考、解答。通过习题的演练，让学生将知识点进一步应用到实际解决问题当中。四、课堂小结今天我们发现了哪些数学规律？这些运算定律是怎样发现、归纳的？对于加法的交换律、结合律的应用，我们已经知道的有哪些？学生思考并回答让学生体验成功的喜悦，进一步拓展学生的思维和创造能力。文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 HS4W10I4N2X3 ZE2V6W6S2H1文档编码:CM6B6W3W5K8 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