《2022年2015新人教版数学四年级下册第一单元四则运算教案 .pdf》由会员分享，可在线阅读，更多相关《2022年2015新人教版数学四年级下册第一单元四则运算教案 .pdf（14页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、第一单元四则运算第一课时加、减法的意义及各部分间的关系教学目标1、结合具体情境通过对算式变换的比较，理解和掌握加、减法的意义和各部分之间的关系。2、在探索加、减法各部分之间的关系的过程中，发展抽象、概况的能力，进一步建立代数的思想。3、在用抽象文字表示加、减法各部分间的关系的过程中，感受数学的内在逻辑性，体会数学的价值。教学重难点教学重点：理解和掌握加减法各部分之间的关系。教学难点：表示加、减法各部分间的关系。教学准备：课件、学习单。教学过程一、创设情境，提出问题1师：同学们，你们知道中国新世纪四大工程之一，被誉为“天路”的工程是什么吗？生：青藏铁路2师：青藏铁路的建设创造了很多高海拔地区铁路
2、建设的奇迹，今天这节课我们就从数学的角度一起走近青藏铁路。（出示主题图）3师：你能根据图中的信息提出什么数学问题吗？生 1：西宁到拉萨的铁路长多少千米？生 2：格力木到拉萨的铁路长多少千米？生 3：西宁到格里木的铁路长多少千米？二、自主探究，加减定义1师：同学们提出的问题能够解决吗？我们先来看看第一个问题，请每个同学自己动手试一试。2学生独立解题3汇报交流，展示解题过程：预设：814+1142=1956 4师：为什么用加法计算？生：把两段合在一起计算。5师：你还能提出什么用加法计算的问题吗？（学生提出数学问题）6师：用你自己的话说一说什么是加法？生：把两个数合并成一个数的运算叫加法。（板书：加
3、法定义）7师：你知道加法算式中这些数都叫什么名字吗？介绍加法算式各部分名称（加数+加数=和）8师：刚才同学们还提出了两个问题，他们能解决吗？请大家试一试，看看谁的速度快。9学生列式计算。（2）1956-814=1142（3）1956-1142=814 10师：同学们计算的真快，没看到大家列竖式呀，你们是怎样计算的？生：参考加法算式解可以。11师：为什么用减法计算？生：因为知道了两段的和求一段就可以减去另一段。12师：你能提出一个用减法解决的实际问题吗？13师：请你用自己的话说一说什么是减法？生：已知两个数的和与其中一个加数，求另一个加数的运算叫减法。（板书：减法定义）14师：你知道减法算式中这
4、些数又叫什么名字吗？介绍减法算式各部分名称（被减数-减数=差）三、小组交流，明确关系1师：观察黑板上的算式，你有什么发现？预设：数都一样，运算不同2师：我们能根据一个加法算式很快的写出两个减法算式，加、减法各部分到底有怎样的关系？看来我们这节课除了要知道什么是加、减法，还需要研究它们之间的关系。下面我们就来研究一下。（板书课题：加减法各部分之间的关系）文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H
5、1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编
6、码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F
7、8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10
8、R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1
9、R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N1
10、0P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP
11、7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B13师：根据黑板上的三个算式和算式中各部分的名称，你能发现加、减法各部分之间有怎样的关系吗？4小组讨论并组内交流5全班交流6整理总结：（1）加法各部分间的关系：和=加数+加数加数=和-另一个加数（2）减法各部分间的关系：差=被减数-减数,减数=被减数-差,被减数=减数+差7师：请同学们利用刚才的算式814+1142=1956、1956-814=1142、1956-1142=814验证大家总结的发现。8师：请观察我
12、们总结的结论，看看你又有什么新的发现？小组交流一下。生 1：加法是减法的相反运算，减法是加法的相反运算。生 2：减法是加法的逆运算。9学以致用：数学书P3 做一做10抽象概括，总结升华。我们通过这三个算式的联系，初步了解了加减法各部分之间的关系，而且验证了加减法各部分之间的关系。也共同归纳出了如下的关系：（1）加法各部分间的关系：和=加数+加数加数=和-另一个加数（2）减法各部分间的关系：差=被减数-减数，减数=被减数-差，被减数=减数+差四、巩固应用，拓展提高1基本练习，巩固新知。（1）数学书 P3 练习一1 下面各题应用什么方法计算？为什么？滑雪场上午卖出86 张门票，下午卖出 59 张门
13、票。滑雪场全天一共卖出多少张门票？滑雪场全天卖出145 张门票，其中上午卖出86 张，下午卖出多少张？文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H
14、1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编
15、码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F
16、8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10
17、R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1
18、R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N1
19、0P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1华光文具店运来一批练习本，卖出370 包，剩下 630 包。运来多
20、少包练习本？兴华小学一共有学生843 人，其中男生 418 人，女生有多少人？（2）根据加、减法各部分间的关系，写出另外两个算式2综合练习：数学书P3 3 五、课堂总结1师：通过学习加减法各部分之间的关系，你知道哪些关系你能说说吗？2学生交流。3师：通过本节课学习你能说说你的心得、收获以及不足吗？第二课时乘、除法的定义及各部分间的关系教学目标1理解乘除法的意义，理解除法是乘法的逆运算，并会在实际中应用2学生自己总结乘、除法各部分间的关系，并会应用这些关系进行乘、除法的验算文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC
21、1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N
22、10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 Z
23、P7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8
24、H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档
25、编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2
26、F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O1
27、0R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B13在分析过程中，培养学生的推理、概括能力4培养学生养成良好的验算习惯教学重点：掌握乘、除法各部分间的关系，并对乘、除法进行验算教学难点：理解乘、除法的互逆关系，以及用除法意义说明一些题为什么用除法解答教学过程一、创设情境，提出问题。师：花不但是植物繁殖的重要部分，而且还有着很多美好的寓意。荷
28、花代表着纯洁，牡丹则代表着高贵。今天这节课我们要用数学的眼光来欣赏花，看看大家能发现什么数学信息。（出示主题图）3.师：你能根据图中的信息提出什么数学问题吗？生：每个花瓶里插3 枝花，4 个花瓶一共插多少枝花？二、自主探究，乘、除法定义。1.师：同学们提出的问题能够解决吗？请每个同学自己动手试一试。2.学生独立解题3.汇报交流，展示解题过程：生 1:3+3+3+3=12 生 2：3 4=12 4.师：大家都是怎么想的？生 1：每个花瓶中有 3 枝花，四个花瓶一共就是4 个 3 相加。生 2:4 个 3，也可以用乘法表示，就是34。5.师：看来 4 个 3 相加也可以表示为34。你认为哪种表示方
29、式更简便呢？为什么？预设：乘法，因为加数个数多时可以用一个数表示个数。6.你还能提出什么用乘法计算的问题吗？7.师：用你自己的话说一说什么是乘法？生：求几个相同加数和的简便运算叫乘法。（板书：乘法定义）8.师：你知道乘法算式中这些数都叫什么名字吗？介绍乘法算式各部分名称（因数因数=积）文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4
30、ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O
31、8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文
32、档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV
33、2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O
34、10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 H
35、C1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4
36、N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B19.师：在上节课我们学习加、减法时发现一个加法算式可以改写出两个减法算式。今天你能结合情景和这个乘法算式也改写出用其他运算方法计算的问题吗？小组讨论一下。9.学生讨论并列式。（2）12 3=4（3）12 4=3 10.师：谁来说一说，你是怎样想的？这两个除法算式代表什么含义？生 1：有 12 枝花，每 3 枝插一瓶，可以插几瓶？12 3=4 生 2：有 12 枝花，平均插到4 个花瓶里，每个花瓶插几枝？124=3 11.师：为什么用除法计算呢？生：因为知道了两个因数的积，求另一
37、个因数。12.师：你能提出一个用除法解决的实际问题吗？13.师：想一想什么是加法，什么是减法？然后，请你试着用自己的话说一说什么是除法？生：已知两个因数的积与其中一个因数，求另一个因数的运算叫除法。（板书：除法定义）14.师：你知道除法算式中这些数又叫什么名字吗？介绍除法算式各部分名称（被除数除数=商）三、小组交流，明确关系1.师：观察黑板上的算式，再想一想我们是如何研究加、减法的，你有什么发现？2.师：我们能根据一个加法算式很快地写出两个减法算式，又能根据一个乘法算式很快写出两个除法算式，现在你有什么想研究的？生：乘、除法各部分到底有怎样的关系？3.师：同学们非常善于思考，看来我们这节课除了
38、要知道什么是乘、除法，也需要研究它们之间的关系。下面我们就来研究一下。（板书课题：乘、除法各部分之间的关系）4.师：根据黑板上的三个算式和上节课的学习经验（课件出示加、减法各部分关系），你能发现乘、除法各部分之间有怎样的关系吗？5.小组讨论并组内交流6.整理总结：文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1
39、文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:C
40、V2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7
41、O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3
42、HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I
43、4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4
44、 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3
45、O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1（1）乘法各部分间的关系：积=因数因数因数=积另一个因数（2）除法各部分间的关系：商=被除数除除数=被除数商被除数=商除数7.师：请同学们结合刚才的算式，验证大家总结的发现。8.师：请观察我们总结的结论，看看你又有什么新的发现？小组交流一下。生 1：乘法是除法的相反运算、除法是乘法的相反运算。生 2：除法是乘法的逆运算。9.学以致用：数学书P6 做一做10.抽象概括，总结升华。我们通过这三个算式的联系，初步了解了乘、除法各部分之间的关系，而且验证了乘、除法之间的关系。11.师：关于乘、除法的知识研究
46、到这里，你还有什么疑问或还想深入研究的吗？生：在有余数的除法里，被除数与商、除数和余数之间有什么关系呢？12.师：关于这个问题大家是怎么想的呢？具体的内容我们下节课就要研究，请你回家思考一下这个问题。四、巩固应用，拓展提高五、课堂总结：1师：通过学习乘、除法各部分之间的关系，你知道哪些关系你能说说吗？2学生交流。3师：通过本节课学习你能说说你的心得、收获以及不足吗？文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 Z
47、P7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8
48、H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档
49、编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2
50、F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O10R3 HC1R8I4N10P4 ZP7T3O8H1B1文档编码:CV2F8Q7O1