2022年北师大版三年级下册《分一分一》word教案 .pdf

名师精编优秀教案认识分数分一分（一）的教学设计吉林省吉林市龙潭区世纪小学杨雪教学内容：北师大版第六册第五单元“认识分数”的第一课时教学目标：一、结合具体的情境和直观操作，初步理解分数的意义，体会学习分数的必要性;并会正确的读写分数，知道分数的各部分组成。二、会用折纸、涂色等方式，表示简单的分数。三、通过丰富的数学活动，培养学生的观察能力、动手操作能力，及口头表达能力。四、体会分数来自生活实际需要，感受数学与生活的联系，激发学生对数学学习的兴趣。教学过程：教学过程设计意图名师精编优秀教案一、创设情境，引出新课1、师：在生活中，同学们分过东西吗？现在请你拿出自己带来的东西，分给你的同桌，想一想怎样分才是公平合理的呢？2、学生动手分自己带来的东西。3、学生汇报分的结果4、你们能发挥想象、通过小组讨论用自己喜欢的方式来表示“一半”吗？。课前布置学生每人只能带一样东西，数量最多不能超过四个。如让学生带各自喜欢的水果、面包、饼干等，激发学生的好奇心，激发学生的学习欲望。此时，有的学生可能说每人分到 2 个，有的可能说每人分到 1 个，还有的可能说每人分到半个等。培养学生边想边分的能力。学生通过合作，可以画各式各样的图形来表示，也可以发明一种符号来表示，激发学生的探索欲望。文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 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HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1名师精编优秀教案5 师：那么你们知道国际上通用的表示“一半”的数学符号吗？教师板书并说明“”就表示平均分。6、像 1/2 这样的数叫做什么数呢？这就是我们今天所要学习的内容分数，教师板书课题。二、观察操作，探究新知1、认识 1/2 1）让学生回顾一下刚才把一个物体平均分的过程。2）让学生完成题签。（课本 56 页练一练）3）让学生用一张正方形的纸，折一折一个物体的 1/2。2、认识几分之几1）拿出一张纸，让学生动手折一折，画一画，涂一涂来表示自己喜欢的分数。2）展示学生的作品。3）让学生说一说自己表示的分数的意义，教师可以指导学生完成表示过程。（如“我把一张正方形的纸平均分成几份，涂明确本节课的教学目标加深平均分的印象通过练一练，体会 1/2 不仅可以表示半个苹果，还可以表示半片树叶、半件衣服等。通过折纸表示 1/2，使学生发现有各种各样的折法，拓展学生的思维。通过丰富的数学活动，让学生在活动中初步体会分数的意义。学生通过表述，加深对分数意义的表述。文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 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ZP2I4J1M9Y1名师精编优秀教案出其中的一份，用分数表示是几分之几）3、指导读写分数1）师：刚才大家都通过不同的方法表示出自己喜欢的分数，像1/2、1/4、2/4、4/8都是分数。2）观察这些分数，他们都是由几部分组成的？（分数线、分母、分子）请同学们也举出几个分数来介绍一下分数的各部分名称，并说一说分母、分子各表示什么。3）我们在写分数的时候要先写分数线，再写分母，最后写分子。4）我们不仅要会写，还要正确的读出来。（电脑出示 57页“说一说”）请学生读出来，并在题签上写一写这三个分数。三、巩固练习，理解应用1、辨析：有几个小朋友是这样表示分数的，对不对，为什么？2、有一些可爱的图形，它们组成了一个新的图形，快来看一看。（课件出示书 58页 4 题）3、让学生结合实际，举例说明生活中的“几分之一”、“几分之几”。明确分数的意义。介 绍分 数各 组成 部 分 的 名称。并通过举例来加深理解。介绍分数的写法。让学生通过独立的读、写分数，加深对分数读写法的掌握。通过辨析，检验学生是否理解了分数的意义与平均分的联系。体会分数也能用于估测图形的面积。通过举例，使学生加深分数与实际生活的联系。文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 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HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1名师精编优秀教案四、回顾总结，反思评价这节课你学会了什么？学得怎样？你有什么感想和建议？只要你做生活中的有心人，善于用分数的眼光去观察我们周围的世界，你一定会发现更多的分数。鼓励学生课后进一步观察、交流。文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 ZP2I4J1M9Y1文档编码:CB8D3O6B8H9 HH2X1Y3E6D1 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