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幼儿园课件互动版本有趣的对称_数学_中班_教案+ppt课件图片

  • 2026-05-11 07:42:32
幼儿园课件互动版本有趣的对称_数学_中班_教案+ppt课件图片

有趣的对称

中班 数学

活动目标

l认识轴对称图形,以部分图形为依据判断出整体图形。

l能运用对折的方法剪出对称图形。

活动准备

l课件准备:“拯救小鸡”情景图片;;组图“复原另一半”;“找对称”图片;“大团圆”图片。

l纸面教具:《找对称》《对称的剪纸》。

l材料准备:笔、彩色纸、剪刀。

活动过程

l出示图片“拯救小鸡”导入情景,激发兴趣。

——母鸡妈妈遇到了一个困难,要向我们求助,一起看一看。

——原来鸡妈妈带着小鸡们在户外散步,遇到了老鹰,抓走一只小鸡,鸡妈妈很伤心,她想寻求小朋友的帮助。你们愿意帮忙把小鸡拯救回来吗?

——我们要闯很多关,才能救出小鸡,有信心吗?

l出示组图“复原另一半“,引导幼儿通过闯关游戏认识轴对称图形。

1,出示图片“复原五角星”,引导幼儿找出五角星的另一半,初步感知轴对称。

——想救小鸡,第一关我们要找出五角星的另一半,把五角星复原。

——你是怎么找出五角星的另一半的?

小结:图中的虚线是五角星的中心线,五角星左右两边的大小和形状是一样的。

2.出示图片“修复蝴蝶”,引导幼儿配对图中的蝴蝶。

——请小朋友找出蝴蝶的另一半翅膀,把蝴蝶们复原。

3.展示修复好的蝴蝶翅膀,并鼓励幼儿说明配对理由。

4.出示组图“复原另一半-3”,引导幼儿理解轴对称。

——以蝴蝶身体为中心线,观察身体两边的翅膀,你发现了什么?

小结:这三只蝴蝶的以身体为中心线,它们左右两边的大小、颜色、形状和花纹完全相同,只是方向相反,我们把这种形式叫做轴对称,中间的这条线叫对称轴。

l出示图片“找对称”,分发纸面教具《找对称》,引导幼儿找出对称的图形。

1.出示图片,分发纸面教具,请幼儿在纸上判断这些图形的对称情况。

——恭喜小朋友成功闯过第一关,接下来进入第二关。

——请你给对称的物品打上“√”,给不对称的物品打上“×”。

2.操作课件,验证猜想。

——哪些物品是对称的?它们的对称轴在哪里?

——为什么音符不是对称的?(符头的方向一样)

l投放彩色纸和剪刀,鼓励幼儿剪出对称的图形。

——恭喜小朋友成功闯过第二关,接下来我们将进入第三关,你们准备好了吗?

1.思考如何用纸张剪出对称的图形并尝试动手剪。

——有什么办法,可以用这张彩色纸剪出对称的图形呢?请你试一试。

2.集体交流,分享成功剪出对称图形的方法。

——你剪出的图形是对称的吗?是用什么方法剪出对称的图形的?

3.幼儿再剪纸,引导将纸对折,从折线开始剪,剪出对称的图形。

小结:将纸对折,折线就是这张纸的对称抽,从折线开始剪,剪出来的图形是对称的。

l出示图片“大团圆”,展示小鸡被成功解救画面,体会闯关成功的快乐。

——谢谢小朋友们,在小朋友们的帮助下,成功拯救出了小鸡,小鸡终于和鸡妈妈团圆了。

活动延伸

l区域活动

在数学区中投放纸面教具《对称的剪纸》,鼓励幼儿找出正确的图形。

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  1. CONNECT:[ UseTime:0.000677s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001020s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000389s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000780s ]
  6. SELECT * FROM `set` [ RunTime:0.000347s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000879s ]
  8. SELECT * FROM `article` WHERE `id` = 495119 LIMIT 1 [ RunTime:0.000663s ]
  9. UPDATE `article` SET `lasttime` = 1779015017 WHERE `id` = 495119 [ RunTime:0.001486s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000295s ]
  11. SELECT * FROM `article` WHERE `id` < 495119 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000624s ]
  12. SELECT * FROM `article` WHERE `id` > 495119 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000488s ]
  13. SELECT * FROM `article` WHERE `id` < 495119 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000857s ]
  14. SELECT * FROM `article` WHERE `id` < 495119 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001152s ]
  15. SELECT * FROM `article` WHERE `id` < 495119 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001353s ]
0.105776s