2022年新人教版小学数学二年级上册《几百几十加减几百几十》教案 .pdf

学习好资料欢迎下载新人教版小学数学二年级上册几百几十加减几百几十精品教案教学内容：教材 9697 页例 3 和例 4 教学目标：1、使学生能够掌握几百几十加、减几百几十的计算方法，并能正确笔算。2、培养学生根据具体情况选择适当方法解决实际问题的意识，体验解决问题策略的多样性。3、培养学生的迁移能力，将学习过的两位数加减两位数迁移到本节课学习的内容上来，并引导学生总结方法。教学重难点：掌握笔算方法并能正确计算。教具准备：多媒体课件、口算卡片、纸牌、练习纸教学设计：一、创设情境，生成问题师：美好的生活环境，能够让我们心情舒畅，身体健康，学习快乐。保护环境，人人有责。所以，我们学校就组织了一个环保小组，定期进行各种的环保活动。用课件出示主题图学习加法的笔算计算几百几十加减几百几十.ppt 师：请看，环保小组的同学正在干什么？（收集矿泉水瓶）师：请仔细观察收集矿泉水瓶情况统计表，你能发现哪些数学信息？师：看着这张统计表，现在组长丽丽正头痛着，什么事呢？要想知道够不够，谁能说说自己的想法？（如果把两周加起来，得数比 500 大的就够送一次，如果得数比500 小的，就不够送一次。）学习好资料欢迎下载我们应该先算出什么？课件出示下面的问题：第一周和第二周共收集了多少个?二、探索交流，解决问题（一）探索交流加法计算方法1、师：要求第一周和第二周共收集了多少个，应该怎样列式？板书：180+340=（或 340+180=）得数是几？你会算吗？好，请同学们在练习本上列式计算。独立思考：学生在练习本上独立解答。先做完的同学要想一想，自己是怎样计算的？小组交流：先对照得数，再互相说说自己是怎样计算的？听听你们小组共有几种不同的想法？全班交流：谁能勇敢的站起来说一说：“是怎样计算的？”（口算和笔算）引导学生重点汇报笔算的方法。汇报算法。（多名学生汇报）教师板书：1 8 0+3 4 0 5 2 0 师：同学们听清楚了吗？这笔算的方法，大家有没有什么地方要提醒同学们注意的？（为什么百位上不是写4 而写 5？那个小小的 1 是从哪里来的？）同桌再内相互说说算法。文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3学习好资料欢迎下载小结笔算几百几十加几百几十的方法。课件出示几百几十加减几百几十.ppt 1、相同数位对齐。2、从个位算起。3、十位上的数相加满十，向百位进一。还有别的算法吗？（学生自由发表意见。）算法 1：18+34=52，所以 180+340=520。算法 2：100+300=400 80+40=120 400+120=520 算法 3；因为 18个十加 34 个十等于 52 个十。所以 180+340=520 小结多种方法，引出用笔算较简便。同学们提出了这么多种的计算方法，很利害。但你们最喜欢哪一种方法呢？为什么？（因为笔算较简便）2、巩固应用：230+540=320+180=几百几十加减几百几十.ppt（二）、探索交流减法的计算方法。师：根据统计表的这两个数学信息，你还能提出哪些数学问题？生自由提问题，教师用课件出示两个重要的数学问题：几百几十加减几百几十.ppt1 第一周比第二周少多少个？第二周比第一周多多少个？怎样列式？板书：340 180=-问：得数是几？刚才这两个数相加咱会计算，那么这两个数相减咱还文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3学习好资料欢迎下载会计算吗？学生独立计算。小组交流算法。将自己的计算方法，在四人小组中交流一下吧。全班交流算法。谁愿意说说得数是几，自己是怎么计算的？笔算。教师根据学生的回答选择板书：3 4 0 1 8 0 1 6 0 同学们听清楚了吗？让学生看着黑板说说笔算方法。这笔算的方法，大家有没有什么地方要提醒同学们注意的？还有其他算法吗？指名简单说说。如：a、340-100=240 240-80=160 b、34 个十减 18 个十得 16 个十，即340-180=160 2、巩固 490130=240160=3、引出课题：同学们仔细观察比较黑板上的算式和我们以前学过的两位数加减两位数的算式有什么不同？板书：几百几十加减几百几十（三）总结笔算的方法和注意的地方。几百几十加减几百几十.ppt（四）、打开书本 P96P97，看书质疑。问：还有什么不明白的地方吗？（或还有什么问题吗？）把书本例题的得数填好。三、巩固应用，内化提高几百几十加减几百几十.ppt 文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3学习好资料欢迎下载1、笔算下面各题410+250 570-380 630+290 340-160 2、谁来做小老师?（每四人小组一张）340+370=610 570-380=290 280+160=20 3 4 0 5 7 0 2 8 0+3 7 0 3 8 0+1 6 0 6 1 0 2 9 0 2 0（）（）（）小结：笔算时应该注意什么？1、相同数位对齐。2、从个位算起。3、十位上的数不够减，从百位退一,在十位上加十再减。3、猜猜是几？4、你能猜对吗？5、走进生活：（1）课本第 99 页第 2 题（2）“六一”节到了，我们一、二年级的同学搞联欢会，一年级有150人，二年级有 160人。老师准备了 300 瓶水，够吗？四、回顾整理，反思提升今天，我们学习了什么？还有什么问题吗？文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3学习好资料欢迎下载文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 HI7U2K6F1D5 ZN6T1L7C5G3文档编码:CF7K6G2F7P5 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