2022年人教版小学数学二年级上册第二单元两位数减两位数教案 .pdf

100 以内的加法和减法（二）两位数减两位数（退位减法）教学目标1、掌握两位数减两位数被减数的个位是0如何退位的计算方法.2、通过学习的计算方法,总结出笔算减法的计算方法。3、培养学生用所学知识解决实际问题的意识。重点难点理解退位的含义;让学生理解计算方法并提醒学生计算时要注意的问题.教学过程第 2 课时一、复习导入1、口算：14-9=32-8=14-3=64-8=14-7=12-3=42-5=63-4=72-9=82-3=2、计算：43-25=91-72=72-27=设计意图:此处教师注重评价的体验，使学生得到心理上的满足，体验的成功的快乐。二、探究新知1、组织活动聪聪给我们出了这样一道减法题：50-24=学生讨论交流后完成本题。1)列竖式要注意什么问题？从哪位算起？个位上0 减 4 不够减。怎么办？2)十位上的5 被借走了一个1，还剩几？3)四人小组讨论：笔算减法要注意什么？师提示：从十位退1 后，个位要算（）减（）。个位向十位退1 后，十位再算（）减（）。引导学生自己解决50-24 的退位问题。设计意图:为学生提供适当的交流时间，通过讨论促使孩子们参与到知识的形成过程中。、汇报方法各小组根据刚才的汇报，做下面的题。然后再次讨论笔算减法要注意什么？81 80 35 90-69 -61 -8 -7 A:写竖式时，相同数位要对齐。B：计算时，从个位减起。C：如果个位不够减，就从十位退1。D：退位点提醒我们从十位减1。教师巡回指导注意规范学生的书写格式。设计意图：此环节的设计注重学生对两位数笔算减法计算过程的经历和计算方法的理解与运用。三、方法应用师：你能模仿我们刚才学习的知识自己写一道这样的算式吗?请你任选一道题，做在本子上，看看自己能不能独立完成。师：谁愿意把自己算的题目介绍给大家？（几位同学把自己的算式投影在屏幕上，指名口述是怎样算的，集体订正。）设计意图：在师生共同总结了退位减法的算理和计算方法后，教师放手让学生自己列算式，给他们一个锻炼的机会，培养他们的创新和应用能力。四、梳理知识，总结升华这节课学习了什么？说一说你是怎样计算两位数减两位数的？应该注意什么？五、课堂检测课堂检测A卷第一题填空笔算减法要注意，相同（）要对齐。从（）减起。如果个位不够减就从（）。第二题笔算下面各题 50-34=76-38=60-27=81-18=90-26=第三题算一算、比一比，左右两题有什么不同，说一说应注意什么？68 68 72 70 -39 -36 -52 -52附：参考答案1、数位个位十位退一2、50-34=26 76-38=38 60-27=33 82-18=64 90-26=64 50 76 60 82 90-24 -38 -27 -18 -26 26 38 33 64 64 3、29 32 20 28 每一组算式中都是一道退位减，一道不退位减。课堂检测B卷第一题帮 小 鸡找妈妈文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1第二题计算第三题解决问题雨 伞 多 少钱一把？给您50元，找你38 元.附：参考答案1、43 43 85 85 85 19 85 19 19 43 43 2、21 35 43 34 95 64 41 59 55 70 3、50-38=12（元）六、布置作业课堂检测B卷文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 HX6R8Z10E4K10 ZR10B6E4P9J1文档编码:CM6H4H5P5G3 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