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【2026年北师大版新教材】小学数学二下2.2《小蜗牛慢慢爬》教学设计

  • 2026-04-11 02:13:56
【2026年北师大版新教材】小学数学二下2.2《小蜗牛慢慢爬》教学设计

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2026年春北师大版二年级数学下册第二单元第二课时

PART 01

课时教学目标
(一)核心素养目标
  1. 数学眼光
能从折纸作品(小蜗牛、坦克)里识别出圆柱、长方体等立体图形,感知立体图形在创意作品中的组合应用。
2. 数学思维
尝试用不同长短、宽窄的纸条制作立体图形,能想办法解决“纸条不合适”这类制作中的问题。
3. 数学语言
能简单描述小蜗牛、坦克的制作步骤,说出自己在折纸过程中遇到的困难和调整方法。
(二)教学目标
(1)能指出坦克作品里包含的长方体、圆柱等立体图形; 
(2)能用长方形纸条做出小蜗牛(多层圆柱),能用纸条合作做出坦克的上下部分;
 (3)愿意和同伴分享制作中的困难与调整办法,感受立体图形组合的趣味。

PART 02

教学重点难点
(一)教学重点
识别折纸作品中的立体图形,用纸条制作小蜗牛和坦克的基本步骤。
(二)教学难点
调整纸条的长短、宽窄,做出符合造型的立体图形(比如小蜗牛的多层圆柱)。

PART 03

教学设计思路
从有趣的小蜗牛、坦克作品导入,先识别其中的立体图形,再学做小蜗牛,小组合作做坦克,最后分享制作问题与调整方法,让学生在动手里感知立体图形。

PART 04

教学准备
(一)教师
小蜗牛、坦克的成品作品,不同长短、宽窄的长方形纸条,胶水(或双面胶)。
(二)学生
准备2-3张不同长短、宽窄的长方形纸条,自带安全的粘贴工具(比如固体胶)。

PART 05

板书设计
图形变变变:小蜗牛&坦克
  1. 作品里的立体图形:
• 小蜗牛→圆柱(多层)
• 坦克→长方体+圆柱
2. 制作小技巧: 纸条卷一卷→粘一粘→组合立体图形

PART 06

教学资料补充
(1)古代纸条立体物:古人用长纸条卷成圆柱做“纸筒灯”,既轻便又能透光,是用平面纸条变立体的生活智慧。 
(2)“立体图形找朋友”游戏:一人拿纸条做的立体图形(圆柱/长方体),其他人找同形状的生活物品,快速巩固图形认知。

PART 07

教学过程
环节1:导入(约5分钟)
咱们看这页的小蜗牛和坦克,是不是特别可爱?这些都是用平平的纸条做出来的立体作品哦!今天咱们不光要看,还要自己动手做,既能玩又能认咱们的“立体图形朋友”。
环节2:新授(约20分钟)
先看这个坦克作品——你们能找到里面的长方体和圆柱吗?坦克的身体部分是长方体,履带那里是好几个圆柱拼起来的,是不是很巧妙?
再看小蜗牛:它是用长长的纸条一圈一圈卷起来的,卷出不同大小的圆柱,粘在一起就变成蜗牛壳啦。咱们先拿自己的纸条试试,先卷一个圆柱,要是纸条太短卷不够圈,就换长一点的纸条,宽窄不一样的话,卷出来的圆柱粗细也会变哦。
环节3:练习(约15分钟)
现在分组做坦克:一组负责下半部分(履带,用几个圆柱拼),一组负责上半部分(长方体的车身),做完之后把两部分组合起来。要是做的时候纸条不合适,比如履带的圆柱太粗,就换窄一点的纸条调整。
做完坦克和小蜗牛后,完善自己的作品,和旁边的同学说说:你做的时候遇到啥困难了?是咋调整的?比如纸条太短,是不是换了长纸条?
环节4:总结(约5分钟)
今天咱们用纸条做出了小蜗牛和坦克,还在里面找到了圆柱、长方体。原来平平的纸条,卷一卷、粘一粘就能变成立体图形,组合起来还能做出这么有趣的作品——数学是不是既好玩又有用?

PART 08

作业设计
(一)基础性作业
回家给爸爸妈妈展示你做的小蜗牛/坦克,说说这个作品里用到了哪个立体图形。
(二)拓展性作业
用不同的纸条做一个新的立体动物(比如小虫子),明天带来和小伙伴分享,说说你用了什么立体图形。

PART 09

教学反思
(一)成功经验
用有趣的作品导入能快速吸引注意力,小组合作做坦克让学生互相帮忙,动手过程里自然感知了立体图形的组合。
(二)改进方向
部分学生不会调整纸条的长短宽窄,后续要提前准备不同规格的纸条,示范“纸条和立体图形大小的关系”,帮学生更快找到合适的材料。

end

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000652s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000532s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000552s ]
  8. SELECT * FROM `article` WHERE `id` = 458617 LIMIT 1 [ RunTime:0.000390s ]
  9. UPDATE `article` SET `lasttime` = 1775856342 WHERE `id` = 458617 [ RunTime:0.021336s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001277s ]
  11. SELECT * FROM `article` WHERE `id` < 458617 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000703s ]
  12. SELECT * FROM `article` WHERE `id` > 458617 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000625s ]
  13. SELECT * FROM `article` WHERE `id` < 458617 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003371s ]
  14. SELECT * FROM `article` WHERE `id` < 458617 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000664s ]
  15. SELECT * FROM `article` WHERE `id` < 458617 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000638s ]
0.125612s