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1、两位数加两位数（不进位）加法教学设计教学内容：二年级 教材第 8-10 页，两位数加两位数（不进位）。教学目标：1探索并掌握两位数加两位数（不进位）加法的计算方法，体会算法的多样化。2在理解的基础上学会并能够熟练地进行竖式计算。3 培养学生的操作能力，能够表达、交流自己解决问题的过程和结果。教学重难点：理解并掌握两位数（不进位加）的笔算方法教学准备：课件，小棒，计数器，题卡教学过程：一、口算练习3+5=30+50=40+7=20+40=6+80=13+5=3 加 5 表示什么？30 加 50 表示什么？二、合作探究，获得新知（一）创设情境：（1）学校决定组织我们二年级的小朋友去参观博物馆，出示
2、图。请大家仔细观察这幅图，你发现了哪些数学信息？（2）准乘 70 人是什么意思？能帮老师解决这个问题吗？大家估算一下哪两个班可以合成一辆车呢？（小组交流）汇报不同的乘车方法。（3）同学们说的方案有这么多，这节课我们先来验证这种方案可不可以：板书：二（1）班和二（2）班，二（3）班和二（4）班36+30=35+34=（4）让学生观察算式特点。从而引出课题板书：两位数加两位数（5）师问：“同学们，能不能用自己喜欢的方法计算一下。”自由计算，老师巡视，适时帮助学困生。等学生有80%完成后，抽生汇报。可能有以下几种算法。生 1：口算法：30+3060，60+666 生 2：摆小棒法。先摆3 捆零 6
3、根再摆 3 捆。最后合计6 捆零 6 根。学生边说边演示。生 3：先在计数器上的十位拔3 个珠子，个位上拔6 个珠子。然后在十位上加 3 个珠子即 6 个珠子，合起来是66。学生边说边演示。（6）引导学生明白算理：把相同数位上的数相加具体说明：学生在说算法时老师适时板书，用纸条写好。十位和捆数用一种颜色，个位和根数用一种颜色。教师边演示边引导学生发现摆小棒和拨计数器都是要把36 和 30 相同数位上的数相加。为下面竖式这种方法的讲解打好基础。注意课件制作时在相同数位对齐时重点闪烁。（三）竖式的引出与讲解1、问：可是我们做题时不能总带着小棒和计数器，那该怎么办？引发学生进一步的对于计算方法的思考
4、。如果有学生能说出用竖式计算的方法，可以借此引出竖式的教学，文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 Z
5、D9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3
6、T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 Z
7、D9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3
8、T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 Z
9、D9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3
10、T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6如果没有学生说出来的话，由教师直接引出：这节课我们就来学习一种以后会经常用到的方法，竖式。2、竖式计算的教学师：以 36+30=为例，我们以前经常见到的这种算式又叫横式，在横式下方用竖式计算其结果，请同学们瞪大眼睛看黑板看谁一遍就能学会用竖式计算的方法。教写竖式师：想想我们刚刚摆小棒和拨计数器的过程
11、，你认为十位上的3 应该写在哪个数的下面？个位上的0 又应该写在哪？你为什么这么认为？结果应该是多少？你是怎么算的？师：你会用竖式计算了吗？谁能说说竖式书写的时候应该注意什么？引出板书：相同数位要对齐。（四）独立完成35+34=说一说计算过程三、运用新知，解决问题1、33+43（用竖式计算）投影两名学生写的竖式，并说一说自己的计算过程。2、看图列竖式计算让学生体验学习数学的乐趣3、找回丢失的数字宝宝，将竖式补充完整4、猜一猜蝴蝶后面藏着几？四、课堂小结文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9
12、J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6
13、P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9
14、J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6
15、P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9
16、J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6
17、P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9
18、J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6这节课我们学习了两位数加两位数加法的计算方法，谁来说说这种题目怎么算？竖式书写时应该注意哪些？五、作业布置1、第 12 页“做一做”第1 题、第 2 题。2、第 13 页“做一做”第1 题、第 2 题。课后反思：这节课的教学内容是在学生已经掌握两位数加整十数、两位数加一位数的基础上学习的内容，如果只要求正确计算得数并不难，但是要求学生又快又准地用最恰当的方法计算却不是件容易的事。因此我觉得本节课的难点是：在算法多样化的基础上优化算法。这里设计学生动手操作，自主探索得出两位数加两位数的不同计算方法，体
19、现了标准中“鼓励学生独立思考，提倡算法多样化”的理念，这部分内容属于更新的知识，有多种方法可探究。学生可利用前面学过的计算方法，如：口算、摆小棒、拨计数器的方法得到算式的结果。除了我们学过的计算方法外，还有同学想到了以前妈妈教过他的用竖式解决的方法。算法多样化不是一题多解，而是尊重学生个性差异的体现。我们的学生由于生活背景不同，知识经验不同，所以对于相同的问题，解决的方法也不一定相同，这时学生便需要教师的肯定、激励和引导。最后让学生自主地去比较、选择和完善自我。文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S
20、4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV
21、8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S
22、4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV
23、8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S
24、4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV
25、8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6文档编码:CV8A3T6P9O8 HV6N1B8G4S4 ZD9J2X1X2O6