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幼儿园课件互动版本一人一半(二等分)_数学_大班_教案+ppt课件图片

  • 2026-06-15 11:56:06
幼儿园课件互动版本一人一半(二等分)_数学_大班_教案+ppt课件图片

一人一半

二等分

大班 数学

活动目标

l理解二等分的含义,知道二等分后的图形大小、形状一致。

l尝试用多种方法将一个物体分成相等的两份。

活动准备

l课件准备:“大胃王吃披萨”对话音频及图片;“分饼干”组图。

l纸面教具:《分披萨》。

l材料准备:剪刀。

活动过程

l播放对话音频及图片“大胃王吃披萨”,引导幼儿思考分披萨的方法。

——奇妙餐厅的披萨闻起来太香啦!两位大胃王也来排队了,可是所有口味的披萨都只剩下最后一份,他们每款都想吃,熊猫奇奇和熊猫妙妙不知道要怎么办,小朋友们,你们有什么好办法吗?(两位大胃王一起吃)

——小朋友们都说大胃王可以一起吃,老师来问问他们愿不愿意。

——大胃王,小朋友们说你们可以一起吃,你们愿意吗?

——太好了,大胃王同意了,可是他们提出了一个新的要求,希望披萨只切一刀,就能分成一模一样的两份,每份披萨他们都要一人吃一半,你们觉得可以怎么分这些披萨呢?

l操作课件,引导幼儿初步理解二等分的含义,知道二等分后的图形大小、形状一致。

——奇奇和妙妙想了好几种分披萨的方法,哪一种分法符合大胃王的要求呢?请你选出来。

——这块圆形的披萨被分成了两片,大胃王们想知道这两片披萨到底是不是一模一样的,有什么办法能证明呢?

小结:将切好的两片披萨叠放在一起,如果能够完全重合,就说明这两片披萨是一模一样的。像这样把东西分成一模一样的两份,就是二等分。

l发放纸面教具《分披萨》及剪刀,鼓励幼儿探索将图形二等分的方法。

1.发放纸面教具及剪刀,请幼儿动手操作。

Ø活动建议:教师注意提醒幼儿安全使用剪刀。

——美味的圆形披萨很快就吃完了,大胃王还想继续吃,请小朋友们挑选一块其他形状的披萨分一分,看看怎样才能把它也分为一模一样的两片吧。

2.幼儿展示操作结果,分享二等分的方法。

——你是用什么方法进行二等分的?

——怎么判断两片披萨是一模一样的?

小结:将手中的披萨完全对折,再沿着折线剪一剪,剪完后还可以叠一叠,如果完全重合,就证明自己分出的两片披萨是一模一样的。

3.操作课件,展示二等分的不同方法。

——让我们一起来看看这些形状的披萨可以怎样二等分,找找有没有我们没想到的分法?

l出示组图“分饼干”,引导幼儿了解更多二等分的方法。

——吃了美味的披萨,大胃王非常满足,奇奇和妙妙还送了他们一份刚烤好的饼干。这次大胃王决定要自己试试分饼干,请小朋友们判断一下他们的饼干是二等分的吗?

——大胃王是怎么分的?

活动延伸

l区域活动

在数学区,继续投放纸面教具《分披萨》,引导幼儿继续巩固二等分的方法并探究四等分的方法。

l家园共育

请幼儿回家后和家长找一找家里可以被二等分的物品。

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  1. CONNECT:[ UseTime:0.000427s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000315s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000582s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000501s ]
  8. SELECT * FROM `article` WHERE `id` = 502353 LIMIT 1 [ RunTime:0.000556s ]
  9. UPDATE `article` SET `lasttime` = 1782841506 WHERE `id` = 502353 [ RunTime:0.000721s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000230s ]
  11. SELECT * FROM `article` WHERE `id` < 502353 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000545s ]
  12. SELECT * FROM `article` WHERE `id` > 502353 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000477s ]
  13. SELECT * FROM `article` WHERE `id` < 502353 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001396s ]
  14. SELECT * FROM `article` WHERE `id` < 502353 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000822s ]
  15. SELECT * FROM `article` WHERE `id` < 502353 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000743s ]
0.082148s