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。那么我们该如何写一篇较为完美的范文呢?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。
平面镜成像教学反思篇一
虽然学生有了“对称”的知识铺垫,但对于人和像也是对称的这一现象是较难感知体会的。尤其是镜子外的物体和镜子内物体的像左右对称是本课的难点。
如何化解这一教学难点呢?在教授这一节新课之前,我让学生在家练习照镜子,在镜子前做不同的动作,观察镜子里自己的成像是什么样的。这一预习作业的布置对我在新课的难点教学上起到了推波助澜的作业。
在新授课时,我通过教材上两个生活中常见的现象,即倒影和成像来让学生认识镜面对称,直观的让学生认识镜子中的“像”,接着进一步引导学生观察探究,使学生发现人和像是关于镜面对称的。
因为课前已经让学生在家进行了照镜子的练习,接下来,我和学生玩起了照镜子的游戏——把人和像活生生的搬至课堂(老师照镜,请学生模仿像),让学生在“实物”面前,丰富感官,深刻感知体验。我设计了早上起床后一系列的照镜子的动作,并贯穿着故事情节,引发了学生的兴趣,学生的参与度极高。这一设计环节,充分体现了学生经历、参与、自主、探究。
后来,在测试中,我发现对于“看镜中的钟面”,“看镜中的文字、数字”这些题目都做得都不错。可是,却还是有人在人和像的题目上“左右不反”了,在教学这一难点时不是口口声声说“左右相反”吗?游戏时我还一直强调:人和像都在同一边。也许正是因为朝同一边,他们才是左右相反的。我发现这一问题后,在另一个班新授这一课时,我不再强调“同一边”,练习发现学生的正确率还是挺高的。
通过两次不同教学《镜面对称》的难点,我发现,老师不应该总站在学生的角度去思考如何把易变难,或者只是把死板的用公式交给学生套用来解题。应该让学生自己去大胆的实践,反而能取得更好的成效。
平面镜成像教学反思篇二
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平面镜成像教学反思篇三
这节课终于上了,感觉比想像中好,但难点还没有很好地解决。下面我谈谈这节课我是怎样设计的,哪些地方可以改进一下,让难点得以很好地解决。
一开始让学生看一个《猴子捞月亮》的故事,通过情境提出猴子为什么捞不到月亮的问题引起学生思考从而引出课题,接着让学生拿镜子自己照一照感受一下镜子照出的像有什么特点。通过学生的回答引出镜面对称的特点——像与物体前后上下方向不变,左右相反。然后通过让学生出来对镜子照一照、两个学生一个扮照镜子,一个扮演镜像来验证这节课的学习重点,同时也解决为什么左右方向相反难点(因为它们是相对的)。接着做两个小练习来了解一下他们对学习重点的掌握情况。接着问:是不是只有人照镜子时才会有这样的特征呢?通过这个问题引起学生思考,然后让学生在练习本上写一个汉字、数字、算式在镜子上照一照,再次让学生感受到物体在镜中的镜左右方向相反了。然后做一些抢答题,出示镜面数字、汉字、算式,让学生说了原来的数字、汉字、算式,重点分析6、9的镜像与原来数字的对比。在这个练习中出现了一个钟面,开始引出这节课的难点——看镜面时间写实际时间,但在这里花了很长时间都没有把这个难点解决,导致这节课精心准备好的图片欣赏环想,镜子的作用,课后拓展题没有按时完成。
回想这节课,一直都很顺,为什么难点没有解决?我反思原因可能是在定钟面时间这个环节里,我没有遵循从浅入深原则,一下子就出示一个镜面上是7:05分的钟面,把学生一下子难住了,我就让学生在我下发已画了刻度线的钟面上写画时针和分针,然后有镜子照一照,看看有什么发现?但是还有大部分学生没有理解过来,结果在这里浪费了很多时间也没讲好。后来评课时,他们的建议是我的难度太大了,应先出示一个整时的钟面,让他们先学会看时针如何变化,让出示一具半时的钟面,让学生看一看时针不是对准数字时又怎样看,这样让学生学会看简单的再出示我所说的7:05的钟面,这样会好理解一点。想一想,他们讲得有道理。
在听了邓老师上这节课后,又让我找到我设计这节课上的不足了。她的设计跟我的基本上一样,不同点就在于他的练习上有创新。他在设计看镜面上的汉字、数学、算式,写回实际的汉字、数学、算式这个环节里,他不是出示镜面字就让学生说实际的字,而是出现实际的字,让学生从两个好像都是镜面里的字中选一个,这样学生就真正掌握了知道才会分析找出正确答案了。由于难度提高了,邓老师没有采用我原来让学生在练习本上写一个汉字、数字、算式在镜子上照一照,再次让学生感受到物体在镜中的镜左右方向相反了这个环节,而是直接让学生选,结果他在这里花的时间较长,我想这里如果采用我先学后练习,练习采用邓老师的设计,这个环节就很好了。在这节课里,邓老师在讲钟面时间这个环节里吸取了我上次的失败教训,把钟面时间的难度分散,但上的效果还不是很理想,通过自己上的体会和听课的感觉,发现原来可能是我们设计的多媒体课件里的镜面时钟不明显,导致学生以为看到的就是一个实际的钟面。在后来的评课里,我们一致认为要有一个情境明显地看到有一个镜面里时钟,这样学生才不致于写出钟面时间就以为是实际的钟面时间,并且还要准备一个大大的教具钟,这样便于验证给学生看。
通过再次的备课,听了谢老师的课后,我终于知道如何解决这个难点了。谢老师创设情境,出示了一张相片,并告诉学生这是去一个朋友家照的,你们能从这个镜子里的钟面看出我是什么时候拍的吗?学生一下子就能明白了题意,并能说出正确的实际时间了,谢老师如果这个钟面只有刻度没有数字人们看吗?让学生通过讨论、思考,总结出如何看钟面的时间——根据镜面对称的特点,左右方向相反,只要在另一边对应位置画了实际的时针和分针位置就行。
通过对这节课的研究过程中,让我在通过了上课,评课,听课,知道了这节课如何设计,也使我知道了我的不足。让我在以后的练习设计中注意从浅入深,把难点分散处理,这样让学生学是轻松学得好。通过对精品课程的研究,让我获益良多。
平面镜成像教学反思篇四
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平面镜成像教学反思篇五
一、让学生从生活中感受知识
一开始展示了一张在生活中常能看到的场景——水中倒影,从观察图片、欣赏图片,找生活中的实例,到思考现象的本质,在这个活动中,有了认识的过程,有了思维的价值,也使活动的过程成为了探索图形性质的有效载体。
二、让学生从操作中体验收获
在认识镜面图象时,把镜子用到课堂上,引导学生把生活中每天都要发生的事当成数学问题来思考,加强数学知识与生活实际的联系,知识就不再刻板,从活动中鲜活了起来,学生也更有兴趣。在游戏中进一步感知照镜子的活动,除了进一步感知了镜象的特征,也让课堂气氛活跃了起来,增强了学习的乐趣。体验式教学既尊重学生的主体地位,发挥学生的主体作用,在学生动手操作中,使每个学生在这个过程中获得知识及情感方面的体验,在体验中获得不同的发展。
三、分层次让学生感知体验
“照镜子时人和像左右相反”这一性质理解得不好。于是,我分层次先让学生经历猜测后,再设计游戏验证。在照镜子时,特意让学生在右手上作好标记,再看镜中的像,我发现,当学生看到人和像手上的标记后,学生的眼睛一下子亮了——左右是相反的。为了让每一个学生都明白,我还紧接着与全班玩起了照镜子的游戏(老师当照镜的人,学生表演出“像”的样子)。
平面镜成像教学反思篇六
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平面镜成像教学反思篇七
【教学内容】人教版《义务教育课程标准实验教科书·数学》一年级上册第69页内容及练习。
【教学目标】
1.知识与技能目标:通过实践检验活动,使学生初步认识镜面对称的现象。
2.过程与方法目标:通过动手操作、合作讨论和游戏等活动,加强学生对镜面对称现象的感知。
3.情感态度与价值观目标:激发学生对镜面对称现象进行探究的好奇心,激励学生利用生活经验主动地探索未知。
【教学重点】通过实践检验活动,初步理解镜面对称的现象。
【教学难点】理解镜面的左右是发生变化的现象。
【教具准备】大镜子一面,数字卡片,课件,字母卡片。
【学具准备】每人一面小镜子,数字卡片,字母卡片,水果一个。
【教学过程】
【课后反思】
1.要营造师生亲和的课堂氛围。首先教师尊重学生要体现在一言一行上,亲切生动的话语,微笑和蔼的表情,自然真挚的体态,让学生从听觉、视觉及整个身心都感受到舒服、自然、放松,让学生感受到教师对他们每个人的关爱。不用怕失败、不用怕犯错误,随时得到的是鼓励、激励。教师会和他们同思考,同提问,同判断,同理解,同解决。师生携手,学习知识,解决问题。学生在这样的课堂氛围中乐于参与,主动提问,积极实践,对学习也更加自信了。
2.要满足学生需要,让不同学生得到不同发展。在新授中,首先出示判断题,让学生产生分歧,主动提出用实践验证的方法来解决。鉴于学生的生活经验和思考方式的不同,应尊重学生的个性特征,建议自主选择实践操作的内容和形式,让每个学生能根据自己的认知水平和学习能力选择适合自己的验证方式与合作形式。能力强的学生选择了自己实践观察镜面对称中的一些现象,有的学生则与同伴合作共同实践操作,观察这些现象。这样教学既能满足学生多样化的学习需要,又能使不同层次的学生学习到不同的数学,得到不同的发展。
3.活动要丰富有序,关注学生的学习过程与方法。课堂始终在活动中帮助学生观察体验镜面对称的现象。通过学生的个人活动、生生合作活动、师生合作活动,充分体验、感知镜面对称的一些现象,尽可能地满足了学生求知、参与、交流、实践和自尊的需要。学生积极参与每一个教学环节,情绪高昂,切身感受了学习数学的快乐,品尝了成功的喜悦。
本课有以下不足,有待进一步改进。
1.镜面对称、平面对称都是对称中的现象,“镜面对称”一词对学生而言超出范围,用“对称”更为合适。
2.学生照大镜子来感知、观察镜内外现象的时间和活动都少了。应该让学生充分照镜子,使学生建立表象,感受、理解镜面对称现象。
3.课件应该再生动形象些,能用动画表现出镜内外人前后、上下位置的不变、左右位置发生变化就更好了。
4.练习活动中蝴蝶等的半个图案如果能给每个学生一个,让学生自己拿图案照镜子,利用镜面对称看到图案的整个面貌就更好了。
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平面镜成像教学反思篇九
新教材人教版小学数学第三册第五单元《观察物体》中有一节镜面对称(书本第69页)。教学中只要求让学生通过观察图片、照镜子等活动,初步认识镜面对称的现象,初步了解镜像的性质就可以了。
教学时我利用学校现成的大镜子,课前我就把孩子们招呼到了大镜子前,让他们在镜子前做各种自己喜欢的动作,看看镜中的你和镜外的你有什么不同。课始我先请个别孩子在镜子前表演,其他的孩子观察表演孩子镜中镜外的不同,几个孩子表演下来,孩子们很快就发现了:照镜子时镜子内外的人上下、前后位置不变,左右位置发生对换。有了体验后的发现,孩子们再一次在镜子前展示自己优美的动作,加以验证找到的结论。
带着表演中的喜悦,带着真切的体验,孩子们回教室后很快投入了对图片的观察中,一张两张,你说我说,个个感悟非浅,尤其是看镜子里的时间,孩子们也判断地非常出色。欣喜之余,我出示了随堂练习中的一道练习:下面哪一张是小红拿着的?
思考片刻,就让孩子们用手指表示自己的选择,一看:1、2、3均有。不忙,听听孩子们的理由吧。生1:刚才我们照过镜子,镜子内外只有左右互换,没有上下互换,所以我选择1(选择同样答案的孩子一片附和)。生2:我们刚才照镜子时是发现镜子内外只有左右互换,没有上下互换,但刚才照的只有一个人(事物),现在有四个图了,我觉得1不对,应该是2。生3:我觉得1是对的,你看,镜子中朝左的1里朝右,镜子中朝右的1里朝左了(对!对---又是一片附后声),似乎选择1的同学是对的。
课后,回到办公室,心里始终有点疑问:究竟哪个是对的,假如弄错了,这不是要误人子弟吗?犹豫间,拿起纸笔,画了几张视力图片,跑到镜子前,一个一个仔细地对照起来。不做不知道,一做吓一跳,果真练习中选择1是错的。原来孩子们在分析时,只考虑了一个物体的左右要发生互换,却忽略了一排物体照镜子时,每个物体的位置都要改变,假如原来物体的标号是1、2、3、4,镜子中的物体顺序就是4、3、2、1了。因此,对练习中的选择应该是2不是1。怎么办?该怎样向孩子们解释?于是我动手写了几张含有两个、三个、四个及多个的视力表图,在每个视力图下面标上了顺序号,并事先在视力表实物图下画出了对应的镜中视力表。
一切准备就绪,来到教室,对孩子们说:同学们,今天老师犯了一个很严重的错误,想给同学们道个谦,不过在向大家道谦之前,老师还想带同学们去学校的大镜子前,希望能够在大镜子前让大家弄明白老师犯的是什么错误。孩子们带着好奇,很快地来到了镜子前,场面出奇得安静。望着孩子们真切的目光,我没说什么。而是让孩子们面对大镜子,先叫了两个孩子站在镜子前,让其他孩子观察他们镜中镜外的位置;接着我拿出事先准备好的两个视力图,放在镜子前,让孩子们观察;再接着是三个、四个------好多孩子忍不住了:“老师我知道你为什么让我们再到这里来了”。“我也知道今天早上的选择选错了”。“老师,你不用向我们道谦,我们知道原因了”。“我现在明白该选几了”。“早上xxx同学说的时候我没认真听,仔细一点就好了”。“早上我选2的时候就是这样想的,可是讲不出理由,现在我知道了。”“错了也没关系,现在我们不是更清楚了吗”?------是的,错了没关系,可以再来。只要你有足够的勇气承认错误,从头再来有时会更好。
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平面镜成像教学反思篇十二
“ 镜子中的数学”是在学习了“轴对称图形”的基础上,进一步学习“镜面对称”的教学内容,它是前一课时知识的延伸与拓展。这部分内容是根据“课标”要求新增加的。教材首先通过“湖面的倒影”和“室内墙上镜子成像”两幅主题图情景,让学生发现生活中常见的“倒影”、“镜子成像”现象,蕴涵着重要的数学思想,即 “镜面对称”。再通过“做一做”的照镜子活动,让学生体会“镜面对称”的特征。从教材编写的意图来看,“镜面对称”这部分内容不是纯粹的知识学习,而是一种体验性活动,它包含了丰富的过程性目标。基于这样的认识,我们认为:整个教学过程应以教材为基础,并结合学生实际创设多种感悟情境和活动情境,引导学生在自主探索、合作交流中体验“镜面对称”特征。
1、通过照镜子实践活动,使学生初步认识镜面对称的现象。
2、通过动手操作、合作讨论和游戏等活动,加强学生对镜面对称现象的感知。
3、激发学生对镜面对称现象进行探究的好奇心,激励学生利用生活经验主动地探索数学知识。
通过照镜子实践活动,建立镜面对称现象的表象。
理解镜面对称在镜面成像时所发生的变化。
:小镜子每人一面,课件。
一、水面对称。
1、欣赏“倒影”,激趣导入
多媒体出示:“倒映水中的湖光山色”,即课本第一幅主题图。让学生说出主题图中见到倒影。(山的倒影、树的倒影、房子的倒影、船的倒影、鹅的倒影……)
谁能举例说明一下倒影的“倒”的意思。(上、下)
有没有发现这也是一种对称现象?
2、继续欣赏水面对称图片。
3、导入镜子面对称。
师:你们在哪里还见到过类似“映在水中山色”的现象。(镜子里。多媒体出示:“映在镜子里的擦桌子的男孩”,即课本第二幅主题图)今天,我们就来研究和镜面有关的数学知识。(板书:镜子中的数学)
你们想知道镜子中有哪些数学吗?你们先想一想并提出你最想知道的有关镜子中的数学问题?
二、镜面对称
1、照镜子体验。
拿出事先准备好的小镜子照,做下面动作:
(1)用右手摸鼻子,用右手压住右眼……
(2)换一只手。看看镜子中的自己做的相应动作。
2、猜测判断。课件演示小猴照镜:
(1)左右相换:伸右臂、伸左臂,猜测镜子中会伸哪只手。指生到大屏幕上指一指。
课件演示后得出:右 左 左右
继续演示抬右腿、抬左腿。
(2)上下一样。课件演示小猴跳。演示前先猜测镜子中的猴子会往什么方向。
(3)前后一样。课件演示猴子向前、后退。演示前先猜测镜子中的猴子会往什么方向。
3、小结,归纳特征
照镜子时,镜子外的物体和镜子内的成像前后、上下——不变,但是左右相反发生变化,这就是镜面对称现象。 (板书补充课题“镜子中的数学——镜面对称”)
与水面对称作比较。
三、巩固练习。
1、游戏:教师做镜外人动作,学生做镜中人动作。
师:我蹲下。生:我们也蹲下。师:我起立。生:我们也起立。师:我向前走。生:我们也向前走。师:我向后退。生:我们也向后退。师:我左手摸摸耳。生:我们右手摸摸耳。师:我右手拍拍脸。生:我们左手拍拍脸。师:我抬左脚踢踢腿。生:我们抬右脚踢踢腿。师:我抬右脚踢踢腿。生:我们抬左脚踢踢腿。师:我的左手侧平举。生:我们右手侧平举。
2、选择:哪面镜子是我照的样子,把它圈出来。
3、利用镜子找另一半。
出示半边的蝴蝶、天坛、青蛙、雪花等图案(课本第71页第4题),让学生想办法利用镜面对称,判断出是什么?指出这些图形的对称轴。
讨论:轴对称与镜面对称有什么区别?
4、照镜子中的数字。
写下1—9的数字,用小镜子照一照,看在镜子里是什么样的。
以某一数字为例说明对称。
看镜子中的数字判断是几。
四、回顾总结,反思学习镜面对称现象的收获
1、这节课我们学习了镜面对称,你们学到什么知识?是怎么学会的?有什么体会和收获,有什么疑问要解答?
2、我们可以利用镜面对称的现象帮助我们纠正坐姿、站姿、写字姿势等。
五、布置作业:《课作》p40。
在操作体验中学习。随着素质教育的深入开展,教师的教育观念不断更新:数学教学要以学生的发展为本,让学生生动活泼、积极主动地发展,人人都能获得必需的数学,不同的人在数学上得到不同的发展,使学生获得作为一个现代公民所必须的基本数学知识和技能的同时,在情感、态度、价值观和一般能力方面都得到充分发展。然而这些先进的理念如何在课堂教学中落实呢?如何缩短先进的教学理念与教学现实的差距?尊重学生的主体地位,发挥学生的主体作用,使人人得到不同程度的发展的课堂教学又该是怎样的呢?而“体验学习”重视让学生动手操作,亲身体验,甚至亲身经历,使每个学生在这个过程中获得知识及情感方面的体验,使每个学生在体验中获得不同的发展。
在学习镜面对称前,我让学生拿出事先准备好的小镜子照,做一些简单的动作,观察自己在镜子中的像,使学生获得初步的感知。
然后观察猴子照镜,并结合猜测得出镜子成像的特征,学生情绪高涨,表现出极大的兴趣。
教师做镜中人,学生做镜外人的游戏,更是把学生的情绪推向高潮,在游戏中巩固了知识。
这些活动把一些抽象的数学知识变为学生看得见、摸得着、理解得了的数学事实。能使他们在大量的体验的基础上,对现象进行整理,找出有规律的现象,逐步抽象、概括,获得数学知识,使抽象问题具体化。
平面镜成像教学反思篇十三
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平面镜成像教学反思篇十四
上课铃响了,我故作神秘的走进教室。
师:同学们,老师今天给你们带来一位朋友。
生:(左顾右盼)
师:(出示镜子)从这位朋友的心里找找你自己吧。
接着,我把一张卡片有数字的一面对着镜子,让学生观察正在“照镜子”的数字,这时,
生:老师,怎么镜子里的数和外面的数不一样啊?
我故作糊涂,“是吗?你观察的可真仔细!如果大家都有你这样‘仔细’的眼睛,相信一会儿总会发现更有趣的情况。
师:现在,老师带你们去一个好玩的课堂。
说完,我带着一脸问号的学生,来到了学校的大镜子前。还没站稳,他们就叽叽喳喳,挤眉弄眼,看着镜子里的自己和其他同学的各种怪模样,一下子兴奋得不得了。
我适时地提醒:看看镜子里边的你和镜子外边的你有什么不一样啊?学生的兴奋不减,大部分学生依旧比比划划,只有个别学生能理智地观察镜子内外人与像的不同,并小声地讨论。我料想到有这样的结果,学生是有差异性的,对于二年级学生来说,他们还不能很好的控制玩带来的诱惑,当然会有不同的表现,而我这样引导是想造就一些思考上的先行者。
[照镜子的过程,看似混乱,但绝对是不可缺少的。对于儿童,他们首先接受的是具体形象,这种先入为主的印象是很深刻的。如果硬塞给他抽象的知识,他也可能死记硬背地会了,但体验不到学习的过程,这对于发展学生的思维,培养学生的学习兴趣以及自学能力没有一点益处。这个过程,学生不仅体验了照镜子,还引出了头脑中已有的照镜子印象。]当然,照镜子并不是体验的结束,而是把具体印象转变为抽象知识的一个铺垫。由此,引出了我们的游戏。
学生分成两拨相对站立,以中间的线假作镜子,玩“双胞胎”游戏。整个过程我也参与其中。先由一边同学演,另一边同学学,然后互换角色,让学生充分体验镜子内外物与像的动作相反。这个游戏很好玩,而且有刚才照真镜子作铺垫,学生们几乎是急不可待的做着各种动作。时机成熟,我大声宣布:咱们一起来做机器人吧。于是,我从刚才静静的参与者变成指挥者。我先加入一拨,同学生一起机械地举左手、举右手,另一拨学生做镜子里的动作。然后交换角色。在做动作的时候,我们喊出自己举的是哪只手,学生不难体验镜子里外的左右互换。
这节课学生始终在玩,在玩中体验了镜面对称,也是在玩中学到了镜面对称中所蕴含的知识。而在和学生共同玩的过程中,我也体验到了新课标带给我的震撼。
在新课标的理念中,越来越把知识与生活实际的紧密联系摆在重要的位置。提倡学生从身边,生活中提炼数学知识,并将数学知识有效的运用于生活中去,让数学不再只是书上的数学题,更多地成为生活中的数学,真正做到学以致用,培养学生树立正确的学习观,提高学生对于学习知识的兴趣,让学习数学变得生动起来。
以往,我们也提倡以学生的发展为中心,但是总不敢大胆地放手,把课堂交给学生。这节课给了我很大启发,也坚定了我的信心,随着新课标在教学工作中的深入影响,我们不妨大胆一些,给自己敢于创新和改革的勇气,也要相信学生的能力。在学习过程中,敢于让学生“闹”,让学生“乱”,甚至让学生玩。让他们用自己喜欢的方式去学习,去体验有趣的学习过程。而老师则更多地体现为学习过程的参与者、合作者。当然,无论怎么动,都应有一个中心点作为核心,以此旋转,学生就动得有分寸,玩得有创新。老师引导者和组织者的作用,在此时,要引得准确、恰当;要组织的合理、到位。我觉得,在“玩中学”,在体验中获取知识,确实是低年级教学的好方法。

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