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《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计(6篇)
  • 时间:2025-01-02 17:08:08
  • 小编:那些无名之辈
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范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。相信许多人会觉得范文很难写?下面是小编为大家收集的优
了解自己的学习风格和喜好,找到适合自己的学习方法。总结要有一个明确的结构和框架,以便更好地展现所总结的内容。下面是一篇优秀的总结范文,供大家参考。6.26国际禁
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范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。写范文的时候需要注意什么呢?有哪些格式需要注意呢?接
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每个人都曾试图在平淡的学习、工作和生活中写一篇文章。写作是培养人的观察、联想、想象、思维和记忆的重要手段。范文怎么写才能发挥它最大的作用呢?以下是我为大家搜集的
时间过得真快,总在不经意间流逝,我们又将续写新的诗篇,展开新的旅程,该为自己下阶段的学习制定一个计划了。我们该怎么拟定计划呢?下面是小编带来的优秀计划范文,希望
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。怎样写计划才更能起到其作用呢?计划应该怎么制定呢?下面我帮大家找寻并整理了一些优秀的计
做任何工作都应改有个计划,以明确目的,避免盲目性,使工作循序渐进,有条不紊。写计划的时候需要注意什么呢?有哪些格式需要注意呢?这里给大家分享一些最新的计划书范文
总结不仅仅是总结成绩,更重要的是为了研究经验,发现做好工作的规律,也可以找出工作失误的教训。这些经验教训是非常宝贵的,对工作有很好的借鉴与指导作用,在今后工作中
通过签订合同,双方可以明确各自的责任,降低风险,保障自身权益。当签订合同涉及大额交易时,建议寻求法律专业人士的咨询和参与。需要签订合同时,可以借鉴范文,适当调整
通过签订合同,可以明确各方的责任和义务,降低交易风险。在起草合同时,要思考可能出现的风险和未来的变化。提供一些常见合同范本,供大家进行修改和定制。房屋租赁合同纠
人类社会发展至今,总结已经成为一种重要的思维活动和表达方式。善于观察生活和思考问题,可以为写作提供丰富的素材和灵感。总结范文的内容和结构可以给我们一个参考的框架
确定目标是置顶工作方案的重要环节。在公司计划开展某项工作的时候,我们需要为领导提供多种工作方案。方案对于我们的帮助很大,所以我们要好好写一篇方案。下面是小编为大
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。大家想知道怎么样才能写一篇比较优质的范文吗?下面是小
计划可以帮助我们有条不紊地完成任务,提高时间管理能力。计划需要具体、可行和可量化,避免过于模糊和笼统。以下是小编为大家整理的计划范文,供大家参考,希望对你们有所
计划可以激发我们的动力和决心,让我们更加专注和坚定地朝着目标前进。计划的制定需要考虑到自身的优势和劣势,明确自己需要提升的方面。范文中的计划是基于实际需求而制定
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。我们该怎么拟定计划呢?下面是我给大家整理的计划范文,欢迎大家阅读分享借鉴,希望对大家能
计划是指在一段时间内制定的目标和行动步骤,它可以帮助我们更好地安排和管理时间。计划可以使我们的生活更加有序,提高工作和学习的效率。如果我们想要实现自己的目标,就
方案制定需要明确目标、分析现状、确定资源、制定步骤等多个环节。理清解决问题的思路和步骤,可以采用逻辑性强的分点、分段的方式进行思考和撰写。以下是小编为大家收集的
为了确保事情或工作有序有效开展,通常需要提前准备好一份方案,方案属于计划类文书的一种。大家想知道怎么样才能写一篇比较优质的方案吗?以下就是小编给大家讲解介绍的相
方案是从目的、要求、方式、方法、进度等都部署具体、周密,并有很强可操作性的计划。写方案的时候需要注意什么呢?有哪些格式需要注意呢?下面是小编帮大家整理的方案范文
计划可以帮助我们优先安排任务,使我们能够更有效地利用时间。那么如何制定一份有效的计划呢?我们可以先明确目标,然后分解任务,合理安排时间,制定具体的行动步骤,并进
人的记忆力会随着岁月的流逝而衰退,写作可以弥补记忆的不足,将曾经的人生经历和感悟记录下来,也便于保存一份美好的回忆。那么我们该如何写一篇较为完美的范文呢?接下来
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《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计(6篇)

格式:DOC 上传日期:2025-01-02 17:08:08
《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计(6篇)
    小编:那些无名之辈

无论是身处学校还是步入社会,大家都尝试过写作吧,借助写作也可以提高我们的语言组织能力。大家想知道怎么样才能写一篇比较优质的范文吗?下面是小编为大家收集的优秀范文,供大家参考借鉴,希望可以帮助到有需要的朋友。

《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计篇一

1、知识目标:初步认识角,知道角的各部分名称;会初步比较角的大小;能辨认角和用尺子画角。

2、能力目标:通过让学生观察、操作分析、比较,培养学生的观察能力、动手操作能力和抽象思维能力,发展学生与同伴合作解决问题的意识,并培养学生初步学习用自己的语言表达解决问题的大致过程和结果。

3、情感目标;结合生活情景认识角,使学生感受角与生活的密切联系,并在探索角的过程中获得成功的体验。

让学生形成角的正确表象,知道角的各部分名称,能用尺子画角。

让学生通过直观感知理解角的大小与边的长短无关。

三角板,活动角,,五角星纸片等。

直尺,三角板,,带孔木棒,等

一、激趣导入

师:今天老师还给大家带来了一份礼物,认识它吗?(五角星)

师:那你们知道它为什么叫五角星吗?

生:因为它有五个角。

师:你可真聪明,那你能指出它的角都在哪里吗?生:指角师:不错,这就是它的角,其实在生活中还有很多角,这节课我们就来好好认识角好吗?(板书角的初步认识)这就是这节课我们要学习的新内容——角的初步认识

二、探究新知。

1、联系实际,找角

师:小朋友们刚才能够指出五角星中的角,一看大家就很聪明,老师忍不住想考考大家,我们这里有一张美丽的校园情景图,大家能找出这幅图中隐藏着的角吗?我要看看谁的眼力最好。

生:到前面指角

师:看来大家个个都是火眼金睛,这么快就找出了这里面的角。

3、找生活中的角。师:同学们观察得很仔细,在日常生活中很多地方有角,在我们身边,就有很多物体上有角,你能找到吗?在小组内把你看到的角说给别人听,看哪个小组找到的角最多。(小组活动:找角)

[设计意图:立足三维目标,让课堂和谐平等。学生以小组为单位从身边找角,并且互相说说,一方面充分体现了教学的民主性,给每个学生创造了均等的学习、参与的机会,使每个学生都有了展示自己的机会;另一方面使学生经历了从现实生活中发现角、认识角的过程。使学生体会到数学并不神秘,数学就在日常生活中,就在自己身边,使学生感受到数学与现实生活的密切联系,培养了学生学习数学的兴趣和意识。]

对碰二:初步感知,指角认角

1、指角。师:哪个组的同学想先把你们组找到的角指给大家看?

(注:所有学生指角的过程都是点了一下角的顶点处。)

2、出示红领巾、数学书。这些平时用的实物中有角吗?谁来指一指?

3、引导正确指角。师:老师明白了,同学们指出的角原来是这样一个图形(边说边在黑板上点一个点),这是个角吗?(不是,这是个点)。师:对,这是个点,刚才同学们指的不就是这样吗?想想看,怎样才能将你想的样子完整地指出来?在小组里讨论一下,再指指看。

4、同桌互相指角。

师:哪位同学能指给大家看一看?

师:现在同学们指角的时候,不光指了一个点,还指出了两条直直的线,也就是这样一个图形(出示现成的角),但大部分同学的指法还不对。想不想看看老师是怎样指角的?(演示)

出示幻灯片,练习指角、辩角。

6、角的各部分名称

师:想不想知道角的各部分名称,打开数学书39页看谁先找到答案。

小结:角是由一个顶点和两条边组成的。(学生做笔记)

[设计意图:在这里,学生感知到的角是生活中的角。所以在指角时指的是角的顶点处。教师没有去急着帮学生纠正语言与动作,而是充分利用了学生认知过程中的“盲点”巧妙地引导学生自己发现错误,把学生对角的认识自然地从生活实际过渡到数学知识,同时通过几次“指角”,使学生逐步建立了正确的“角”的表象。然后自然地引出角的各部分名称。]

对碰三:动手操作,比角

1.体会角的大小。

(1)教师演示活动角(两条边张开一些):你发现角怎么样了?怎么会变大的?(板书:张开)(两条边收拢一些):这个角怎么样,怎么又会变小的?

(2)小结:角的大小就是两边张开的大小。

(3)改变角的大小。你能把自己做的角变大变小吗?学生上台展示,教师结合讲评。出示圆形纸折的直角,能做一个比这个角小一些的角吗?那么小很多的角应该怎么折呢?演示钉子板上的角,把刚才做的角变大些,变小些。

[设计意图:让学生通过自己的操作来感知角的大小是与两条边张开的大小有关的,为下面比较的大小作好准备。]

2.比较角的大小。

(1)观察法。师生拿出活动角,教师做出一个角,引导学生做出比老师小和角,找两个小朋友的角和教师的角比。怎么样?(学生回答)

(2)重叠法。①引导学生观察刚才两个小朋友的角,谁的大一些?②学生想办法比较,指名上台演示,得出重叠法。一条边要对齐,看另一边张开的大小,再确定角的大小。③巩固重叠法。同桌做两个角,比一比,教师巡视,指名两个学生演示一下。

(3)体会角的大小与边长无关。

①教师拿出活动角,引导学生做出比老师大的角。

②把角的边剪短,思考:这样的角小了吗?

③学生说理由并用重叠法证明角的大小没变。

④用自己的胳膊形成一个角,把角变大,再变大,想想,你的胳膊变长了吗?把角变小再变小,想想你的胳膊变短了吗?

出示幻灯片,练习比角。

[设计意图:让学生在实践操作过程中体会、理解角的大小与两条边又开的大小有关这一知识点。注重了学生的观察、操作与体验,培养了学生的探索意识和创新意识。]

对碰四:体验感悟,画角

师:现在大家已经会比角了,那你能尝试画一个角吗?

1、学生看书,勾画出画角的方法,边画边读。

2、学生尝试画角,指几名同学板画。

3、教师示范画角,边画边讲解怎么画角。

4、再画一个角,标上角的各部分名称。

课堂小结:同学们,这节课我们一起认识了角,动手比了角,画了角,还在生活中找到了很多的角,其实,只要你善于观察,生活中处处都有数学。

《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计篇二

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《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计篇四

人教版二年级数学上册第38、39页、做一做及练习八第1~3题。

角的初步认识这一教学内容,是学生在已经初步认识长方形、正方形和三角形的基础上进行学习的。由于学生在学习角的有关知识前,通过对许多物体的感知,已经积累了有关角的感性经验,所以教材从引导学生观察实物开始逐步抽象出所学几何图形,再通过学生实际操作活动,如折一折、摸一摸、做活动角等加深对角的认识和掌握角的基本特征。

教材中不要求掌握角的定义,只要求学生认识角的形状,知道角的各部分名称,能辨认角,会画角就可以了。这部分内容,教材在编排上还有两个显著特点:一是强调数学知识与现实生活的密切联系,如主题图“美丽的校园”和例1的内容都是学生熟悉的;二是强调在实际活动中掌握知识,如安排了“做角”“画角”等若干活动,都是想让学生在亲自的动手操作中完成学习任务。

学生熟练掌握这部分内容就为以后进一步学习三角形、长方形和正方形以及平行四边形的角等几何图形奠定了基础,起着承前启后的作用。

1、联系学生生活实际,让学生在生动、丰富的背景中学习数学,感受数学与现实联系,体会学数学的实用性,学有用的数学。

2、引导学生在感知的基础上加以抽象概括,充分遵循(从)感知→(经)表象→(到)概念这一认知规律,采取找一找、看一看、摸一摸、做一做、比一比、想一想、等教学手段,让他们在大量的实践活动中掌握知识形成角的概念。

3、发挥现代教学多媒体的优势,通过形象生动的教学手段吸引学生的注意力,把静态的课本材料变成动态的教学内容,让学生在动手中思维、在观察中分析,把外在可见和内在不可见的角印在大脑里。

1、知识目标:初步认识角,知道角的各部分名称;会初步比较角的大小;能辨认角和初步用尺子画角。

2、能力目标:通过让学生观察、操作分析、比较,培养学生的观察能力、动手操作能力和抽象思维能力,发展学生与同伴合作解决问题的意识,并培养学生初步学习用自己的语言表达解决问题的大致过程和结果。

3、情感目标;结合生活情景认识角,使学生感受角与生活的密切联系,并在探索角的过程中获得成功的体验。

让学生形成角的正确表象,知道角的各部分名称,能用尺子画角。

让学生通过直观感知理解角的大小与边的长短无关。

多媒体课件,三角板,剪刀,活动角,不规则纸,绳子。

一、情境导入,激发兴趣。

师出示小黑板(分别是圆、长方形、正方形、三角形,每一个图形都被遮住了一部分)

让学生猜一猜。

师:我们来玩一个猜图形的游戏,猜一猜是什么图形?(先猜圆形)

追问:“你们为什么不猜成是圆形?你是根据什么来猜测的?”

师:今天我们就来认识图形朋友——角(板书课题:角的初步认识)

二、自主探究,动手实践。

1、联系实际找角(课件出示主题图)

(1)、学校就是我们的大家庭,我们都要爱这个大家。瞧,在这个美丽的画面中,人们在干什么?哪儿有角?(生仔细观察汇报)

生1:老师拿的三角板上有角。

生2:钟表的时针和分针组成了一个角。

生3:老爷爷手里拿的剪刀上有角。

……

(2)、再仔细观察我们周围,你发现哪儿有角?把你的发现小组里说说。学生交流,师巡视。

(从学生的生活经验和实际出发,联系实际寻找生活中的角,让学生充分体会到数学知识就在我们身边,数学来源于生活,生活中处处有数学。)

2、认识角的各部分名称

师:“角”有时很淘气,藏在物体中,找一找这些物体的身体中哪里藏有角?

(课件出示:“剪刀”、“插有吸管的饮料筒”、“水龙头”)

学生讨论后,电脑闪烁各角,从实物中抽象出角。

师告诉学生:像这样的图形就是角。

师:观察这些角,它们有哪些相同点?引导学生用自己的话说。

这些角有什么地方不同?

小组讨论并派代表汇报结果。让学生知道角有各种不同的形状和大小。

这些角有什么相同的地方?

学生汇报后,教师讲解角各部分的名称:顶点、边、边。

仔细观察这些角,你知道一个角有几个顶点,几条边吗?

(借助于现代化的教学手段,通过课件演示形象直观的把角从物体中抽去出来,客观地比较出角的相同点和不同点,降低了教学难度,有利于突出重点、突破难点。)

3、动手操作折出角

师:同学们认识了角,想不想做一个角?(想)

(1)、师:请同学们拿出圆形纸片,这张纸上有角吗?你知道怎样才能折出角呢?试一试,玩一玩。教师巡视。(纸对折,再对折,折出一个角。折得角有大小)

(2)、把你折好的角指给同桌看。

(3)、摸角

学生摸一摸自己折的角,发现什么?有什么感受?并把自己的感受说给小组同学听。

小组汇报:(有一个尖尖的地方是顶点,和两条直直的线叫边。)

(在动手折角的过程中,培养学生的观察、思维、动手操作能力和自主参与、合作交流能力。)

4、动手做活动角

师:同学们真聪明,不仅能折出大小不同的角,还能正确摸出有角的物体。那你们能不能用桌面上的2根硬纸条和1个图钉,做出一个角来呢?(生做,师巡视,随机指导)

师:玩玩你做的角,你能让它变大变小吗?你能用一句话来告诉大家怎样让角变大,怎样让角变小吗?(引导学生用自己的话说)

师:如果老师把角的边剪短,角的大小变了吗?再剪短,变了吗?把你手里的活动角的两边减去一些,角的大小有变化吗?

想想刚刚的活动,你认为角的大小与什么有关?(与两条边张开大小有关)

(角的大小与两条边张开的大小有关,这本是很枯燥难讲的知识,教学中通过对活动角的操作,使学生在玩的过程中很容易的就理解了它们之间的关系,达到了设计的目的。)

5、角的画法:

师:同学们可真厉害,折出了角,也做出了角,想不想画角呢?(想)

(1)、(课件演示)师再示范,请同学们仔细看,先画什么,再画什么?

(2)、生先说画法,再动手在纸上画。

(3)、展示学生作品。(选有代表性的贴在黑板上)

(在动手操作中,检验学生的学习情况,学生也学的高兴,学的开心。)

三、目标训练,拓展提高。

1、做一做。(看谁的眼力好)练习八第1题(课件出示)

下面的图形哪些是角,哪些不是角?

2、数一数,下面图形分别有几个角。练习八第2题(课件演示)

3、下面的两个角,哪个角大?哪个角小?练习八第3题(课件演示)

(以闯关的形式进行练习,更能激发学生的参与热情和积极主动性,使学生始终处于乐学、爱学的心理状态。)

四、归纳总结,共同点评。

师:今天,我们认识了角,知道了角各部分的名称,还会找角、折角、做角、画角。同学们学的很认真。说一说你有什么收获吗?(学生自由发言)

(培养学生的归纳总结、逻辑思维能力,使学过的知识形成系统性。)

五、课下作业,拓展延伸。

一张长方形的纸,剪去一个角,再数一数有几个角。

(培养思维和动手操作能力。)

《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计篇五

谈话:刚才我们欣赏了美丽的稻香小镇——望亭,鱼米之乡美景尽收眼底。你们看到了哪些景物?

问:看,在这些物体上,你能找到哪些曾经学过的图形?

师:小明同学也有发现,听,他发现了什么?

问:你们发现角了吗?角是怎样的呢?

揭示课题:今天这节课就让我们一起走近角、认识角、研究角。(板书课认识)

(设计意图:课前视频《稻香小镇——望亭》动感的画面,震撼的音乐,一方面给学生带来感官的冲击,一方面帮助学生回忆并再现之前学过的平面图形,画面中藏着要认识的新的图形——角,如此忆“形”引“角”,顺其自然地引入了本节课所要研究的新问题,学习在不知不觉中已经开始。)

(一)认识角

1.指角

师:老师这里有一把三角尺,三角尺上有角吗?请同学们拿出三角尺,指一指角。

教师用笔描出“.”,然后取走三角尺。

问:这是角吗?

师:那应该怎样正确的指角呢?(边示范边讲解)先指这里的一个点,再沿着两条边指,最后像这样在两条边之间画一条弧线,这就是角。

生跟着老师一起指一指,再同桌互相指一指。指出课件中物体上的角。

师:这些物体上有很多的角。为了把这些角看得更清楚些,我们把物体上的一些角移下来(课件演示角下移过程)标上角的标记,它们就成了数学上的角。

(设计意图:多次教学实践研究表明:学生找“角”容易,指“角”困难。教师基于学生的认知起点,对不准确的指角方法进行纠正、示范,充分发挥教师的主导作用,实现向“数学化”的过渡,在此基础上,组织学生通过不同层次的指角活动,不断强化对角的形状的感知,为之后的抽象和概括提供必要的经验支撑。)

2.认识角的各部分名称和特征

问:小朋友们仔细观察这些角,它们有什么相同的地方?

师:这些尖尖的地方,有它的名字,叫顶点。(板书:顶点)直直的线是角的两条边。(板书:边)

问:一个角有几个顶点?几条边?

指名学生回答,课件依次出示角的顶点和边。

师:角都是由一个顶点和两条直直的边组成的。

(设计意图:通过比较不同的角,找到共同的特征,使学生越来越清晰地建立起角的表象,同时也培养学生的归纳能力)

(二)巩固角的基本特征

1.判断辨析,再次巩固角的特征

师:课前我们欣赏了美丽的北太湖风景区,你们想去玩吗?想去看美丽的油菜花海吗?那必须通过稻草人的考验才能顺利到达目的地,小朋友们,你们有信心吗?

稻草人1:欢迎同学们来参观油菜花海,请跟我来吧!

稻草人2:小朋友们,我要先考考你们的判断力。

课件出示想想做做第1题,下面哪些是角,哪些不是角?

师:是角的,我们用这个手势表示(√),不是的用这个手势(×)。

学生判断,指名说说理由。

稻草人3:你们的判断力真强,我要给你们点个大大的赞!继续跟我来吧!

2.找一找生活中的角。

稻草人4:小朋友们,角隐藏在我们生活的每一个角落,你们能找到身边物体上的角吗?

同桌合作,互相指一指、说一说。

3.数一数图形中的角(想想做做第2题)

稻草人5:小朋友们,想进入油菜花海大门就必须输入正确的密码。密码是由每幅图角的个数组成的数,看你们是否能顺利找到密码,进入油菜花海!加油!

指名学生上台数一数,写一写。

师:小朋友们,你们输入的密码是否正确呢,让我们一起喊出“开门大吉”,好吗?

课件出示油菜花海视频,视频最后有绿化带工人在修剪树枝。

(设计意图:练习设计遵守循序渐进的.原则,富有层次。通过角的辨析,生活中找角、指角,以及在图形中找角等一系列活动,进一步巩固角的认识,明晰角的特征,同时让学生初步认识到,角作为图形中的一部分,是隐含在很多图形中的。)

(三)感受角的大小

师:为了使景区更美,油菜花海路边的绿化带里,园林工人正在修剪树枝。(课件出示绿化带工人修剪树枝的两张图片,一把剪刀张开得大,一把剪刀张开得小。)

问:小朋友们,你们看到角了吗?仔细观察剪刀上的角,你们有什么发现?

指名回答。

师:也就说明角是有大小的。(板书:角有大小)

问:你们想不想亲自动手创造一个角?

师:老师给大家准备了一个神奇的造角工具,请同学们拿出来,创造一个角,完成后举起来让大家看一看。

学生活动。

启发:我们做出的角称为活动角。现在我们就好好地来利用这个活动角,看看你的本事大不大!请听要求——

师:这是老师做出的角,用你的活动角做一个比老师做的角大很多的角。再举给大家看一看。

问:你是怎么做的?

用你的活动角做一个比老师做的角还小很多的角。做好的举起来。

问:你是怎么做的?

师:通过做角活动,你有什么发现吗?

指名学生边回答边演示。

师:我们一起来感受下。把角变大,再大一点,变小,再变小一点。

问:现在你知道角的大小与什么有关吗?

生:角的大小与两边张开的大小有关。

同桌两人各做一个角,比一比谁做的角大一些,谁做的角小一些。做好的角不能变哦。

学生活动,教师巡视,指名交流。

师发现凭观察难以比出大小的情况,教师让两位学生到讲台前举起角。

问:这两个角,哪个大,哪个小?学生意见不一。

师:有什么好方法来比较出这两个角的大小呢?

指名学生上台来演示比较的过程,发现这两个角的大小相等。

问:你是怎么比较的?

生:把顶点对齐,再把一条边对齐。

课件出示边长不一样的两个角,问:这两个角呢?哪个大,哪个小?怎么比?

师:见证结果的时候到了。课件演示重合。

课件演示把角的两条边慢慢拉长,问:如果把这个角的两条边拉长,角会变大吗?

课件演示把角的边慢慢缩短,问:角的大小有变化吗?

问:所以角的大小跟两条边的长短?

生:角的大小跟两条边的长短无关。

(设计意图:本环节,首先通过剪刀张开的大小初步认识到角是有大小的,角的大小是可以比较的。再让学生每人做一个活动角,并用活动角分别做出比老师做的角大和小的角,力图让学生直观感受到角的大小与两条边张开的大小有关。接着,通过同桌做角、比角,结合课件比较了边长一样、边长不一样的角,但角的大小相等,让学生感知角的大小与两条边的长短无关。注重了学生的操作、观察和体验。这样的活动,能使学生对角的大小获得丰富的体验。)

师:同学们,最近油菜花海管理人员想在长方形油菜花地地里建一个儿童游乐场,如果割掉一个角把剩下的地用来建造游乐场,猜一猜,这块地还有几个角?

学生先猜一猜,再动手操作,教师巡视。

学生回答展示,课件同步演示。

问:你们还能想到不一样的剪法吗?可不可以拐着弯剪?

师:看,这样拐着弯剪,就会剩下6个角。如果这里拐的弯越来越多,剩下的角就会越来越多。你看我们数学就是这样的变化无穷又充满乐趣。

(设计意图:这个拓展练习,学生通过猜想、验证,交流提升数学思维的深刻性和广阔性,让学生在练习中,大胆的猜想,愉悦的思考,充分感受到数学学习的乐趣。)

师:这节课我们认识了一个新朋友——角。你们有什么收获吗?

师:你们的收获可真多呀!对自己的表现满意吗?让我们用一个手势来表示一下成功的喜悦。你看到角了吗?

师:因为有了角的存在,我们的生活变得更加多姿多彩。关于角的知识还有很多,课后大家可以继续探究角更多的奥秘。

(设计意图:让学生用手势表示成功的喜悦,有人用v字,有人画√,使学生感受到角在生活中的广泛应用,再看角多了一份数学的眼光。)

《角的初步认识》教学设计及反思 张齐华角的初步认识教学设计篇六

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记叙文是以叙述为主要手法,生动地描写人物、事件或景物的一种文学作品。总结要注意逻辑性,内容之间要有明确的关联。这是一些正确阅读新闻报道和分析信息的方法和指导,希
社会问题是指在社会中存在的需要解决的各种不良现象或困境。写总结时,我们可以从不同角度和维度进行思考,深入分析问题的本质。以下是一些总结范文,供大家参考和借鉴。新
无论是身处学校还是步入社会,大家都尝试过写作吧,借助写作也可以提高我们的语言组织能力。范文书写有哪些要求呢?我们怎样才能写好一篇范文呢?接下来小编就给大家介绍一
诗歌是一种优美的语言艺术,可以用简洁的语言表达丰富的意境。如果我们想写出一篇好的文章,首先要做好充分的准备工作。这些总结范文凝练了大量的信息,可以帮助我们更好地
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。写范文的时候需要注意什么呢?有哪些格式需要注意呢?以
计划是指为实现特定目标而事先制定的行动方案。它可以帮助我们有条不紊地进行各项工作和学习,提高效率。我想我们应该制定一个详细的计划,以便更好地安排时间和资源。在制
通过制定计划,我们可以更好地安排自己的时间,更好地分配资源和任务。制定计划时要持续反思和调整,随时适应环境和条件的变化。通过参考他人的计划范文,我们可以了解到不
时间就如同白驹过隙般的流逝,我们的工作与生活又进入新的阶段,为了今后更好的发展,写一份计划,为接下来的学习做准备吧!大家想知道怎么样才能写一篇比较优质的计划吗?
制定计划可以帮助我们提前思考和准备,从而避免临时抱佛脚的情况发生。计划的执行过程中,需要不断跟进和调整,确保实施的顺利进行。以下范文可以帮助大家了解不同类型的计
无论是身处学校还是步入社会,大家都尝试过写作吧,借助写作也可以提高我们的语言组织能力。写范文的时候需要注意什么呢?有哪些格式需要注意呢?这里我整理了一些优秀的范
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。计划书写有哪些要求呢?我们怎样才能写好一篇计划呢?以下我给大家整理了一些优质的计划书范
总结不仅能够帮助我们了解自己的成长过程,还可以激励自己继续前进。写总结时要注意语言简练、准确,表达清晰易懂。范文中的经验和教训可以让我们从他人的经历中汲取经验,
总结是对一段时间内工作、学习和生活表现的一种评估和总结。一个简洁明了的总结能够让读者快速了解主要内容。请大家注意,以下的总结范文仅供参考,具体的写作内容还需要根
总结是一种自我激励的方式,能够鞭策我们不断进步,不断超越自我。写总结时要注意语法和用词的准确性,以保证文笔流畅和可读性。以下是小编为大家整理的总结范文,希望能对
总结可以激发我们的创造力和思维活力,提高我们解决问题的能力。写总结时要注重结构的完整性和逻辑的连贯性,使读者能够清晰地理解所总结的内容。通过阅读这些总结范文,我
良好的计划能够提高我们的执行力和组织能力,更好地应对各种挑战和困难。制定计划时需要考虑到自身的能力和资源,合理安排时间和任务分配。在范文中可以看到不同领域和行业
无论是长远计划还是短期计划,都需要我们有清晰的思路和明确的步骤。在执行计划时,我们要不断检查和调整,确保目标的实现。计划的执行需要自我约束和自律,要时刻保持对目
一个好的计划可以提高工作效率,减少犯错的机会。制定计划时要有计划外的预留时间,以备不时之需。以下是一些计划制定的注意事项和技巧,希望能对大家有所帮助。3月服装销
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。大家想知道怎么样才能写一篇比较优质的范文吗?下面是小
作为一名默默奉献的教育工作者,通常需要用到教案来辅助教学,借助教案可以让教学工作更科学化。那么我们该如何写一篇较为完美的教案呢?以下是小编收集整理的教案范文,仅
在人们越来越相信法律的社会中,合同起到的作用越来越大,它可以保护民事法律关系。那么合同应该怎么制定才合适呢?这里我整理了一些优秀的合同范文,希望对大家有所帮助,
在日常生活中,我们会遇到许多琐碎的小事,而总结是帮助我们更好地理清思绪的重要方法。一篇完美的总结应该简明扼要,言之有物,重点突出,不拖泥带水。总结范文中可以寻找
心得体会可以促使我们思考,发现问题并寻找解决方法。写心得体会需要我们有一定的自省和思考能力,能够观察和总结自己的行为模式和思维方式。以下是小编为大家收集的心得体
通过制定计划,我们可以更好地规划工作和学习的内容和进度,避免拖延和摸鱼。制定计划时,我们需要建立明确的时间表和时间节点,以便及时掌握进展情况。制定计划时,最重要
计划不仅可以帮助我们追踪进度,还可以提前预测和解决潜在问题。一个好的计划应该有明确的时间节点和阶段性目标,可以帮助我们掌握进度。以下是一些著名领导人制定计划的经
写总结是一个良好的个人习惯和素养,能够提高我们的学习和工作效率。写总结要注意正面思考,更多地关注解决问题的方法和措施。同学们可以结合自己的实际情况,在这些总结范
一个好的计划可以使我们更加高效地完成任务。要写一篇较为完美的计划,首先需要明确计划的目标和预期成果。如果你正在制定计划,以下是一些案例和实例,可以给你一些创意和
为了确定工作或事情顺利开展,常常需要预先制定方案,方案是为某一行动所制定的具体行动实施办法细则、步骤和安排等。大家想知道怎么样才能写一篇比较优质的方案吗?以下是
通过制定计划,我们可以更好地掌控自己的时间和进度。在编写计划时,要充分考虑可能出现的风险和问题,并制定相应的对策。提供给大家一些计划制定的技巧和方法,希望可以帮
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。相信许多人会觉得范文很难写?下面是小编为大家收集的优
了解自己的学习风格和喜好,找到适合自己的学习方法。总结要有一个明确的结构和框架,以便更好地展现所总结的内容。下面是一篇优秀的总结范文,供大家参考。6.26国际禁
在日常的学习、工作、生活中,肯定对各类范文都很熟悉吧。范文怎么写才能发挥它最大的作用呢?接下来小编就给大家介绍一下优秀的范文该怎么写,我们一起来看一看吧。秩序维
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。写范文的时候需要注意什么呢?有哪些格式需要注意呢?接
在日常的学习、工作、生活中,肯定对各类范文都很熟悉吧。那么我们该如何写一篇较为完美的范文呢?以下是小编为大家收集的优秀范文,欢迎大家分享阅读。浅谈农村小学数学教
拥有一个明确的计划可以增加我们的自信心,激发我们的积极性。计划的执行过程中,我们要及时跟踪和评估进展,及时调整和改进。下面是一些计划范例,供大家参考。首先,为了
计划是提高工作与学习效率的一个前提。做好一个完整的工作计划,才能使工作与学习更加有效的快速的完成。我们该怎么拟定计划呢?以下我给大家整理了一些优质的计划书范文,
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。范文怎么写才能发挥它最大的作用呢?接下来小编就给大家
在当下社会,接触并使用报告的人越来越多,不同的报告内容同样也是不同的。报告的格式和要求是什么样的呢?这里我整理了一些优秀的报告范文,希望对大家有所帮助,下面我们
每个人都曾试图在平淡的学习、工作和生活中写一篇文章。写作是培养人的观察、联想、想象、思维和记忆的重要手段。范文怎么写才能发挥它最大的作用呢?以下是我为大家搜集的
时间过得真快,总在不经意间流逝,我们又将续写新的诗篇,展开新的旅程,该为自己下阶段的学习制定一个计划了。我们该怎么拟定计划呢?下面是小编带来的优秀计划范文,希望
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。怎样写计划才更能起到其作用呢?计划应该怎么制定呢?下面我帮大家找寻并整理了一些优秀的计
做任何工作都应改有个计划,以明确目的,避免盲目性,使工作循序渐进,有条不紊。写计划的时候需要注意什么呢?有哪些格式需要注意呢?这里给大家分享一些最新的计划书范文
总结不仅仅是总结成绩,更重要的是为了研究经验,发现做好工作的规律,也可以找出工作失误的教训。这些经验教训是非常宝贵的,对工作有很好的借鉴与指导作用,在今后工作中
通过签订合同,双方可以明确各自的责任,降低风险,保障自身权益。当签订合同涉及大额交易时,建议寻求法律专业人士的咨询和参与。需要签订合同时,可以借鉴范文,适当调整
通过签订合同,可以明确各方的责任和义务,降低交易风险。在起草合同时,要思考可能出现的风险和未来的变化。提供一些常见合同范本,供大家进行修改和定制。房屋租赁合同纠
人类社会发展至今,总结已经成为一种重要的思维活动和表达方式。善于观察生活和思考问题,可以为写作提供丰富的素材和灵感。总结范文的内容和结构可以给我们一个参考的框架
确定目标是置顶工作方案的重要环节。在公司计划开展某项工作的时候,我们需要为领导提供多种工作方案。方案对于我们的帮助很大,所以我们要好好写一篇方案。下面是小编为大
范文为教学中作为模范的文章,也常常用来指写作的模板。常常用于文秘写作的参考,也可以作为演讲材料编写前的参考。大家想知道怎么样才能写一篇比较优质的范文吗?下面是小
计划可以帮助我们有条不紊地完成任务,提高时间管理能力。计划需要具体、可行和可量化,避免过于模糊和笼统。以下是小编为大家整理的计划范文,供大家参考,希望对你们有所
计划可以激发我们的动力和决心,让我们更加专注和坚定地朝着目标前进。计划的制定需要考虑到自身的优势和劣势,明确自己需要提升的方面。范文中的计划是基于实际需求而制定
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。我们该怎么拟定计划呢?下面是我给大家整理的计划范文,欢迎大家阅读分享借鉴,希望对大家能
计划是指在一段时间内制定的目标和行动步骤,它可以帮助我们更好地安排和管理时间。计划可以使我们的生活更加有序,提高工作和学习的效率。如果我们想要实现自己的目标,就
方案制定需要明确目标、分析现状、确定资源、制定步骤等多个环节。理清解决问题的思路和步骤,可以采用逻辑性强的分点、分段的方式进行思考和撰写。以下是小编为大家收集的
为了确保事情或工作有序有效开展,通常需要提前准备好一份方案,方案属于计划类文书的一种。大家想知道怎么样才能写一篇比较优质的方案吗?以下就是小编给大家讲解介绍的相
方案是从目的、要求、方式、方法、进度等都部署具体、周密,并有很强可操作性的计划。写方案的时候需要注意什么呢?有哪些格式需要注意呢?下面是小编帮大家整理的方案范文
计划可以帮助我们优先安排任务,使我们能够更有效地利用时间。那么如何制定一份有效的计划呢?我们可以先明确目标,然后分解任务,合理安排时间,制定具体的行动步骤,并进
人的记忆力会随着岁月的流逝而衰退,写作可以弥补记忆的不足,将曾经的人生经历和感悟记录下来,也便于保存一份美好的回忆。那么我们该如何写一篇较为完美的范文呢?接下来
人的记忆力会随着岁月的流逝而衰退,写作可以弥补记忆的不足,将曾经的人生经历和感悟记录下来,也便于保存一份美好的回忆。相信许多人会觉得范文很难写?以下是我为大家搜
总结是对事物发展和变化的分析和总结,可以为决策提供有力的依据。最后要进行仔细的审查和修改,确保总结的准确性和完整性。这些总结范文覆盖了不同领域和不同主题,可以拓
合同中的条款应尽量明确、具体,以避免产生不必要的歧义和争议。在起草合同时,应明确双方的权利和责任,避免模糊措辞和不当要求。合同的签订需要仔细阅读和理解其中的所有
坚持计划执行需要克服拖延和诱惑,保持专注和目标导向。要写一篇较为完美的计划,我们首先需要明确目标和任务的重要性和紧迫程度。下面是一份经过实践验证的计划范文,希望
在现在社会,报告的用途越来越大,要注意报告在写作时具有一定的格式。那么什么样的报告才是有效的呢?下面是小编带来的优秀报告范文,希望大家能够喜欢!室内装饰设计实践
计划可以帮助我们更好地规划未来,为我们的成功铺平道路。制定计划需要充分考虑资源的可利用性,如人力、物资和技术等。计划的形式各异,下面这些范文可以给你提供不同的思
时间过得真快,总在不经意间流逝,我们又将续写新的诗篇,展开新的旅程,该为自己下阶段的学习制定一个计划了。计划怎么写才能发挥它最大的作用呢?下面是小编整理的个人今
通过总结,我们可以总结成功的经验并加以借鉴,以避免重复犯错。在写总结时,要注意突出重点和关键,清晰地表达自己的观点和结论。总结范文中的案例可以帮助我们更好地理解
总结是写给人看的,条理不清,人们就看不下去,即使看了也不知其所以然,这样就达不到总结的目的。什么样的总结才是有效的呢?以下是小编为大家收集的总结范文,仅供参考,
光阴的迅速,一眨眼就过去了,很快就要开展新的工作了,来为今后的学习制定一份计划。那关于计划格式是怎样的呢?而个人计划又该怎么写呢?下面是小编为大家带来的计划书优
无论是身处学校还是步入社会,大家都尝试过写作吧,借助写作也可以提高我们的语言组织能力。大家想知道怎么样才能写一篇比较优质的范文吗?下面是小编帮大家整理的优质范文
合同的签署是合作双方达成一致意见的重要标志,具有法律约束力。合同的修订和补充应该遵循正当程序,经过双方的协商和一致同意。如果你需要参考一些优秀的合同案例,不妨浏
时间流逝得如此之快,前方等待着我们的是新的机遇和挑战,是时候开始写计划了。计划怎么写才能发挥它最大的作用呢?以下我给大家整理了一些优质的计划书范文,希望对大家能
时间流逝得如此之快,我们的工作又迈入新的阶段,请一起努力,写一份计划吧。优秀的计划都具备一些什么特点呢?又该怎么写呢?下面是小编整理的个人今后的计划范文,欢迎阅
总结是一种反思和审视的过程,能够帮助我们发现问题并寻找解决方案。在总结中,可以引用他人的观点和经验进行参考。在这些总结范文中,我们可以看到不同人的思考和总结方式
报告是指向上级机关汇报本单位、本部门、本地区工作情况、做法、经验以及问题的报告,那么我们该如何写一篇较为完美的报告呢?下面我就给大家讲一讲优秀的报告文章怎么写,
在日常学习、工作或生活中,大家总少不了接触作文或者范文吧,通过文章可以把我们那些零零散散的思想,聚集在一块。范文怎么写才能发挥它最大的作用呢?下面我给大家整理了
光阴的迅速,一眨眼就过去了,很快就要开展新的工作了,来为今后的学习制定一份计划。那么我们该如何写一篇较为完美的计划呢?下面是小编为大家带来的计划书优秀范文,希望
为了保障事情或工作顺利、圆满进行,就不得不需要事先制定方案,方案是在案前得出的方法计划。怎样写方案才更能起到其作用呢?方案应该怎么制定呢?以下就是小编给大家讲解
时间就如同白驹过隙般的流逝,我们又将迎来新的喜悦、新的收获,让我们一起来学习写计划吧。怎样写计划才更能起到其作用呢?计划应该怎么制定呢?下面我帮大家找寻并整理了
总结是对过去一段时间的工作、学习或生活经历的回顾和总结。总结要紧扣主题,避免跑题和回避问题。通过阅读这些总结范文,我们可以学习到一些写总结的技巧和方法,提高自己
无论是身处学校还是步入社会,大家都尝试过写作吧,借助写作也可以提高我们的语言组织能力。范文怎么写才能发挥它最大的作用呢?下面是小编帮大家整理的优质范文,仅供参考
通过总结,我们可以更好地了解自己在工作和学习中的成就和不足。总结要具备简明扼要、重点突出的特点。希望以下总结范文能够对大家写作总结提供一些参考和指导。车辆违章委
艺术的魅力和价值,让我们感受到美的力量和无限的想象力。好的总结可以让我们更好地反思和改进,我想我们需要学会写出有价值的总结。这里整理了一些成功人士的自我总结经验
总结是把一定阶段内的有关情况分析研究,做出有指导性的经验方法以及结论的书面材料,它可以使我们更有效率,不妨坐下来好好写写总结吧。优秀的总结都具备一些什么特点呢?
计划可以帮助我们提前预见和解决问题,避免临时抱佛脚。在制定计划时,要充分考虑相关的因素和影响因素,以减少不确定性和风险。以下是一些精选的计划案例,让我们一起来学
良好的计划可以帮助我们合理安排时间和资源,从而达到更好的工作成果和生活效果。在制定计划时,尽量考虑到不同情况和突发事件的可能性,并预留一定的缓冲时间。如果你还没
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