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【2026年北师大版新教材】小学数学二下3.1《搭一搭(一)》教学设计

  • 2026-04-09 09:46:54
【2026年北师大版新教材】小学数学二下3.1《搭一搭(一)》教学设计

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2026年春北师大版二年级数学下册第三单元第一课时
一、课时教学目标
(一)核心素养目标
  1. 数学眼光
能从“用小棒搭正方形”的操作中,发现“平均分后有剩余”的数学现象,感知有余数除法在生活分物、搭建活动中的实际应用。
2. 数学思维
通过动手搭、算一算的过程,理解“余数”的含义,初步建立“平均分后剩余部分”的思考方式,感知余数与除数的大小关系。
3. 数学语言
能正确读出有余数的除法算式,用“被除数÷除数=商……余数”的形式表示过程,说出算式中每个数对应的实际意义。
(二)教学目标
(1)认识有余数的除法,理解“余数”是平均分后剩下的部分; 
(2)能结合搭正方形的操作,读、写有余数的除法算式,说出算式各部分的含义; 
(3)能通过简单操作感知“余数比除数小”的特点,愿意参与动手搭、算的数学活动。
二、教学重点难点
(一)教学重点
认识有余数的除法,理解余数的意义,会读、写有余数的除法算式。
(二)教学难点
理解算式中各部分对应的实际操作,初步感知“余数要比除数小”的规律。
三、教学设计思路
从复习表内除法导入,引导学生用小棒搭正方形探究剩余情况,引出有余数的除法算式,解释算式读法与各部分意义,通过练习巩固,感知余数与除数的关系。
四、教学准备
(一)教师
小棒(20根)、搭正方形的示范作品、课件(包含复习题、例题及练一练内容)。
(二)学生
准备15-20根小棒(可用安全的替代物如吸管)。
五、板书设计
有余数的除法(搭一搭一)
  1. 复习表内除法: 10÷5=2 4÷2=2 30÷6=5 20÷4=5 12÷3=4
  2. 搭正方形算式: 13÷4=3(个)……1(根) 读作:13除以4等于3余1
  3. 各部分意义:
• 13:小棒总数 - 4:搭1个正方形需4根
• 3:能搭的个数 - 1:余数(剩余小棒)
六、教学资料补充
(1)古代分物中的余数:商代人们分粮食时,10袋米分给3户,每户分3袋还剩1袋,这“剩下的1袋”就是余数,是古人解决分物问题的数学智慧。 
(2)“余数找朋友”游戏:每人拿12根小棒,分别搭三角形(3根)、正方形(4根),记录余数,找余数相同的同伴,能快速熟悉不同除数下的余数情况。
七、教学过程
环节1:回顾复习,导入新课
咱们先做几道除法题热热身,看课件上的题目:10÷5、4÷2、30÷6、20÷4、12÷3,大家自己算一算。
谁来说说答案?没错,这些都是咱们之前学过的表内除法,正好能分完。那大家能计算“13÷4”吗?这就是咱们今天要学的内容——搭一搭(一)。
环节2:自主活动,探索新知
咱们看课件里的例子:搭一个正方形需要几根小棒?对,4根。现在给大家13根小棒,以小组为单位动手搭一搭,看看能搭几个完整的正方形,还剩几根,顺便用算式把过程和结果记下来。
大家搭的时候可以互相说说思路,我在旁边看看。
有没有小组代表来说说你们的结果?
学生1:每搭一个正方形减4根,13-4-4-4=1,减了3次,剩1根,能搭3个。 学生2:3×4=12,13-12=1,搭3个用12根,剩1根。 学生3:13里有几个4,用除法13÷4,但结果怎么表示?
这个问题问得好——咱们用“13÷4=3(个)……1(根)”表示,这里剩下的1根叫“余数”,这个算式读作“13除以4等于3余1”。这种没正好分完、有剩余的除法,就是“有余数的除法”。
现在对着你们搭的正方形,分组说说算式里每个数的意思吧。
学生1:“13”是小棒总数。 学生2:“4”是搭1个正方形要4根。 学生3:“3”是能搭的正方形个数。 学生4:“1”是剩下的小棒。
咱们再看课件里的例子,同桌互相说说这两个算式里每个数的意思。
学生1:第一幅图里,13是13辆小汽车,5是分给5个小朋友,2是每人分2辆,3是剩3辆。 学生2:第二幅图里,13是13片树叶,5是粘1朵花要5片,2是能粘2朵,3是剩3片。
环节3:当堂训练
看课件里“练一练”第1题,大家自己先想想,一会儿上台来分享你的解答过程。
再看第2题,自己在心里理一理算式各部分的意思,谁来说说你的想法?
环节4:课堂总结
今天咱们学了有余数的除法,大家说说这节课有什么收获?
八、作业设计
(一)基础性作业
回家用10根小棒搭三角形(每3根搭1个),写出有余数的除法算式并读出来,和家人说说算式里每个数的意思。
(二)拓展性作业
用“10÷4=2……2”编一个生活里的分物或搭建问题,明天和小伙伴分享。
九、教学反思
(一)成功经验
复习导入能快速衔接旧知,动手搭小棒让学生直观感知余数,小组讨论和分享让学生主动参与理解算式意义。
(二)改进方向
对“余数比除数小”的引导不够,后续可增加不同小棒数量的搭法对比,强化这一规律;同时可增加算式读法的练习,让学生更熟练。

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  1. CONNECT:[ UseTime:0.000816s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001371s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005940s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000766s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001545s ]
  6. SELECT * FROM `set` [ RunTime:0.003753s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002067s ]
  8. SELECT * FROM `article` WHERE `id` = 458813 LIMIT 1 [ RunTime:0.005819s ]
  9. UPDATE `article` SET `lasttime` = 1775821691 WHERE `id` = 458813 [ RunTime:0.017216s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.009757s ]
  11. SELECT * FROM `article` WHERE `id` < 458813 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010500s ]
  12. SELECT * FROM `article` WHERE `id` > 458813 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.021584s ]
  13. SELECT * FROM `article` WHERE `id` < 458813 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005464s ]
  14. SELECT * FROM `article` WHERE `id` < 458813 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005934s ]
  15. SELECT * FROM `article` WHERE `id` < 458813 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.039865s ]
0.327506s