2022年100以内数的加减法信息窗四 .pdf

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1、学习必备欢迎下载滨河小学新教育实验课时备课年级一年级学科：数学主备人：伊廷燕使用人：周次第课时累计课时课题：100 以内数的加减法（二）信息窗四（1）课型：新授学习目标A类：在解决实际问题的过程中，了解退位减法的算理，掌握两位数减两位数（退位）的笔算方法B类：经历探索 100 以内数的（退位）减法计算方法的过程，体验算法的多样性，感受计算过程的合理性C类：在现实生活中，能发现、提出并解决100以内数的减法计算问题，发展应用意识；初步学会表达、交流解决问题的过程和结果，体验数学与生活的密切联系重点难点掌握两位数减两位数（不退位）的计算方法教学方法自主、合作、探究教学活动补充内容第一板块：激趣导入

2、，揭示课题【时间：分钟】谈话：同学们前几天我们捉过小虾、摆过贝壳、参观过水族馆的鱼。今天老师要带领同学们参观标本室，想知道是什么标本吗？请同学们看图，通过看图你发现了什么？学习必备欢迎下载第二板块：预习检查，探究新知【时间：分钟】（一）提出问题1、整理信息师：谁来做解说员给大家介绍下这些海洋生物标本好吗？2、提出问题师：通过解说员我们了解了这么多海洋生物标本，那么根据你的这些信息你能提出问题吗？学生可能提出：（）水族馆里的鱼类标本比虾类多几种？（）虾类标本比贝类标本少种？（）虾类和鱼类共有多少种？等很多种问题，教师要根据学生的回答筛选本节课要解决的主要问题。（二）自主探索、合作交流、小组合作、

3、探究问题。师：同学们真是聪明提出了这么多的问题，那么我们首先来解决第一个问题：水族馆里的鱼类标本比虾类标本多几种？谁来列出算式？（根据生答，教师板书：（种）师：到底多多少种呢？你们想用什么方法来解决觉这个问题呢？小组合作开始吧！（三）组间交流，解决问题。（）哪个小组愿意把你们的想法说给大家听听？文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5

4、ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文

5、档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5

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7、5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E

8、3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5

9、X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S

10、9O5 ZJ10P1Q2H8E3学习必备欢迎下载生：我们是口算的 生：我们是用小棒摆出来的。（结合学生的操作重点交流个减个不够减，要把捆解开变成根，再和原来的根加在一起根从这里面去掉，注意原来的捆要变成捆，）生：我们是列竖式来计算的。（根据学生的回答，师板书并详细讲解减的退位减在竖式中的计算方法，然后再让学生自己总结笔算加法时应注意什么问题。）（）那么这两种方法你喜欢哪一种？请用你喜欢的方法去解决第二个问题：虾类标本比贝类标本少几种？（放手让学生独立解决问题然后让学生交流自己的算法及其道理。）（）师：谁愿交流一下你的算法？你为什么喜欢这种方法？（使学生经历算法优化的过程）（）老师也喜欢用列竖式

11、的方法。小结：在用这种方法的时候要注意个位不够减速，从十位退，在个位上加，再减。第三板块：巩固练习，拓展延伸【时间：分钟】（一）解决绿点问题，巩固计算方法。1、独立解答，巩固算法。谈话：虾类标本比贝类标本少几种？你能列式解答吗？（学生独立计算。）你能列竖式计算吗？文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码

12、:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1

13、HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 Z

14、J10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档

15、编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B

16、1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5

17、 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3

18、学习必备欢迎下载2、班内交流，强化算法。谈话：0 不够 6 减的怎么办？（引导学生理解算理，总结法则：先从个位减起，个位不够减，从十位退1，在个位加 10，再减。）第四板块：课堂评价【时间：分钟】这节课你有收获吗？你能说说用竖式计算的过程吗？第五板块：当堂作业【时间：10 分钟】1、估算，猜一猜？的背后藏着什么数？7319？4 3217？5 5416？8 3517？8 6317？6 7425？9 2、自主练习的第 1 题。（1）独立提出问题并解答。（2）班内交流。教学反思文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F

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20、1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:C

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22、2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ1

23、0P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码:CD8E4T5X5B1 HL2F4F2S9O5 ZJ10P1Q2H8E3文档编码

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