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小学一年级数学说课稿冀教版篇一
1、 教材分析
《加法》一课是学生在数学学习中首次接触计算的问题,这节课的知识基础是5以内数的分解与组成。通过本节课的学习,学生要能初步理解加法的含义,并能正确计算5以内的加法,在这个过程中,感受数学与生活的联系,增强学习数学的兴趣和初步的数学意识。
2、 学情分析
本课虽是学生在数学学习中首次接触计算问题,但是学生们大都具有一定的计算能力。学生缺少的是对于加法含义的理解,说不清为什么用加法计算。面对学生已经具有一定的学习基础,课程的设计就更应该充满趣味、问题设计有梯度,才能够吸引学生的注意力,完成教学任务,使学生的认知提高一个水平。
3、 教学目标
(1)知识与技能目标
① 通过操作演示,是学生初步了解加法的含义,认识“+”这个符号,能正确读出加法算式。
② 能通过操作计算5以内的加法,是学生初步体会生活中有许多问题要用加法来解决。初步认识加法的意义,会正确计算5以内的加法。
(2)过程与方法目标
通过学生操作,表达使学生经历加法的计算过程。
(3)情感态度与价值观目标
培养学生初步的数学交流意识,积极主动地参与数学活动,获得成功体验,增强自信心。
4、教学重点:
掌握对自己合适、喜欢的计算方法。
5、教学难点:
能从不同计算方法中选择自己合适的方法。
《数学课程标准》明确指出,教师应激发学生的学习积极性,向学生提供充分从事数学活动的机会,帮助他们在自主探索和合作交流中真正理解和掌握基本的数学和知识与技能、数学思想和方法,获得广泛的数学活动经验。本节课我主要采用情境演示法、小组研讨法,同时借助多媒体等教学手段,增大教学容量,提高教学质量。
古人说:“授人以鱼,只供一餐所需;而给人以渔,终身受用不尽。”素质教育也要求学生不仅“学会”,更要“会学”。这节课我将从学生的兴趣出发,坚持以学生为本,引导学生自主探索,充分挖掘他们的创新思维。
1、复习铺垫
让学生将事先准备好的正方形卡片以及圆形卡片摆在桌面上后,分成两堆。引导学生复习1~5以内数的组成,激发了学生的学习兴趣和强烈的探究欲望,为下面的加法算式中得数的得出起到铺垫作用,从而完成新课的导入。
2、探究新知
这个环节分三个步骤进行。
(1)引导学生观察,初步感知加法的含义。首先通过电脑反复演示气球放在一起的过程,让
他们说一说自己的直观感受和体验,或者由老师一边做手势一边引导说,把气球放在一起就是“合起来”的意思。然后通过点子图加深学生对加法含义的理解:把3个点子和1个点子合并在一起,求一共有多少个点子,用加法计算。点子图既突出了合并,又能使学生感受到部分与整体的关系而且,还能体现出由直观情境向半抽象水平的过渡。
(2)学习加法算式。首先引导学生说出:由气球的数量抽象出要用数字3和1表示。然后教师说明:在数学上,要求一共有几个气球,就是要把数字3和1合起来,用符号“+”表示。教师再次强调说明:把3和1合起来,要用加法计算。最后教读加法算式。
(3)动手操作。让学生亲身体验到就是把两只手的圆片合并在一起。这一步通过自己操作,培养学生动手能力。
3、巩固发展,在练习中提高
(1)发散联想,进一步理解加法的含义
①课本第24页“做一做”。②教师启发、引导,让学生说说生活中能用加法算式表示的事例。这样做是为了培养学生的阅读、观察能力以及语言表达能力。
(2)游戏(红花配绿叶)。多种形式的习题设计充分调动了学生参与合作的积极性,引发学生思维的积极性。
(3)课本第25页松鼠玩耍图,通过动画演示引出算式3+2=□。
(4)课本第25页做一做。
① 通过读懂图意,进一步理解加法的含义。
② 巩固5以内加法的计算方法,学生可以根据图点数,在一个数的基础上接着数,也可以用数的组成的知识解决。
③ 通过对比4+1=5、1+4=5和1+3=4、3+1=4这两对算式式,使学生通过直观初步感知“交换两个加数的位置,和不变”,为后面的教学做了铺垫。
4、总结延伸
通过这节课的学习你学到了什么?印象最深的是什么?这里提问的方式引导学生归纳所学知识内容、学习方法,能强化知识的理解和记忆,促进学生掌握学法。
5、布置作业
适量的作业可及时反馈学生的学习情况,培养学生良好的学习习惯和品质。
6、板书设计
这样的板书既体现了新知的形成过程,又突出了教学重点,简洁明了。
7、教学反思
本节课我从学生的兴趣出发,坚持以学生的发展为本,采取情境化教学方式,引导学生自主探究,充分挖掘了学生的创新思维。
(1)了解信任学生,提供展示自我的空间。
(2)指导小组学习,培养交流意识。
(3)发挥课件的动态立体优势,给学生学习的空间。
小学一年级数学说课稿冀教版篇二
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小学一年级数学说课稿冀教版篇三
尊敬的各位评委,大家好!我说课的内容是北师版小学数学一年级上册第七单元《加与减二》中的《买铅笔》一课。说课环节如下:教学分析、教学目标、教学重难点、教学过程、教学媒体设计思路
这一课是学习20以内退位减法的起始课,是在学生掌握了20以内的进位加,以及10以内加减法基础上进行学习的,为今后学生学习100以内数的加减法做好铺垫。使学生通过本课学习鼓励学生独立思考、大胆尝试,从而对数学的本质产生新的领悟。
知识与技能:能正确计算十几减9、减8的减法,并能简单应用。
过程与方法:运用已有的生活经验和知识,探索十几减9、减8的退位减法。
情感态度与价值:培养善于思考、倾听的学习习惯,能理解他人的不同算法。
教学重点:
1、 学会正确计算十几减9、十几减8的退位减法。
2、 理解多样化的计算方法中的一种或几种。
教学难点:
感知计算方法的多样性。
教学过程共分为以下三个环节:
第一环节:创设情境,激发兴趣。(网络)
第二环节:探索算法,解决问题。(多媒体)
第三环节:拓展活动,综合训练。(多媒体、网络)
第一环节:创设情境,激发兴趣。
首先,我创设情境:“小朋友都喜欢做游戏吗?这节课我们就一起来玩一个打靶飞镖的游戏。”根据学生打出飞镖的数量提出数学问题“这节课我们就先来解决15-9= 这一问题。”由此导入新课在这里我改变教学情景,把教材提供的主题图小白兔到袋鼠的文具店买铅笔的情景,设计成学生熟悉而又感兴趣的打靶飞镖游戏,把游戏搬到课堂上,让孩子亲身参与,真切地感受数学与现实生活的密切联系,最终这一情景设计的改变在教学反实践中达到了课堂气氛更为热烈突出的教学效果。
第二环节:探索算法,解决问题。
这一环节探索十几减9、减8的计算方法是本节课的教学重点
1、独立思考15-9的算法:学生经过独立思考,去整理自己的思路,才能在后一环节小组交流中充分发表自己的见解
2、小组交流:这一环节根据借助网络的教学探讨让小组合作具体化,组内交流不流于形式,完成教学目标培养善于思考、倾听的学习习惯,能理解他人的不同算法。因此我在让学生把准备好的算法依次说给组里的小朋友听的时候,提出了具体要求,交流时注意:(1)说的小朋友尽量说清楚,让每个人都听懂你说的意思(2)注意倾听别人的发言,说过的方法就不要重复等
3、全班汇报:引导学生在听与说、议与思的互动过程中,寻找合理,简便的算法来培养优化的意识,利用多媒体展示本课的四种重点方法,在对于是非辨别能力较弱的一年级学生给他一个思考的空间但做出正确的引导,即体现教师主导又让学生主体作用得以发挥,最终形成学生对“20以内退位减法”的深刻理解。
4、学生选择自己喜欢的方法尝试练习15-8=?
第三环节:拓展活动,综合训练。
这一环节,是以一个小兔把萝卜的故事贯穿始终通过“小兔背萝卜” “送小兔回家” 一系列的故事发生发展过程中进行(17-9)的基本应用训练、拓展思维训练等。
既充分发挥了孩子们的创造力,想象力,又让他们在充满生机与乐趣的氛围中,展开想象的翅膀,感受学习的乐趣。
1多媒体整合点:利用多媒体创设符合学生认知心理的情境,一环接一环的故事,好像一集集的动画片吸引着学生.充分发挥教师主导及学生的主体地位,让学生轻松理解新知。
2网络整合点:我请了几位教学资深的领导、老师来帮助我审核这堂课,但由于地域、以及平时班主任工作的繁忙我们真的很难有时间聚在一起讨论,这确实让我感到棘手,后来我利用了我们和平区教师博客进行交流研讨,在这里我发表了我的教学设计,很快得到了更多老师的回复点评,这样棘手的问题几乎不成问题,而且也让更多的老师参与进来,后来我经过三次试教,多次网上研讨,多方面改进,终于今天承载着众多老师的智慧走到了全国大赛。
3有效地进行了信息技术与常态教学的整合:本课我选择的不是网络运用自如,很有网络发挥空间的特殊课例,而是一堂普普通通再常态不过的计算教学课,而它所体现的整合作用却让我受益匪浅,使我对新课标的理念和信息技术与课程整合有了全新的认识,极大地提高了我的教学视野。
在此感谢组委会给我这样一个机会。谢谢各位评委老师。我的说课就到这里。
小学一年级数学说课稿冀教版篇四
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小学一年级数学说课稿冀教版篇五
尊敬的评委、在座老师大家上午好:
今天我们团队课堂教学再现的内容是人教版小学数学一年级上册第四单元《认识物体和图形》。我团队在确定内容后首先理解教材:《认识物体和图形》是学生学习“空间与图形”知识的开始,(课件出示结构图)主要从形状这一角度来使学生初步认识物体和图形。这一单元包括:立体图形的初步认识和平面图形的初步认识。这是教材的编排特点(课件出示)它体现了新课标的两大理念:注重知识与生活的联系;注重在活动中学习知识,通过学生亲自动手操作,自然地完成学习过程,掌握知识。
在理解了教材后我们进行了课前调查了解学生,据我们课前调查,学生大多是六岁,年龄偏小,处在这一年龄段的学生对形状的知觉是通过视觉、触觉、运动觉协同运动的。关于这节课内容学生学前班虽然也认识过这些图形,但很多孩子将“长方体”说成“长方形”,将“正方体”说成“正方形”,也有将“圆柱”说成“长方形”的,将“球”说成“圆”的更多,所以教学目标不能定得太高
基于以上的认识,根据教材的编排特点、课程标准的要求和学生已有的认知水平将教学目标定为:(课件)
1、通过操作、观察,使学生初步认识长方体、正方体、圆柱和球,知道它们的名称,会辨认这几种物体和图形(这是知识与技能方面的目标);
2、培养学生动手操作及观察能力,建立初步的空间观念(这是数学思考方面的目标);
3、通过学生活动,激发学习兴趣,培养学生的合作探究和创新意识。(这是情感与态度方面的目标)
教学重点与难点是:初步认识长方体、正方体、圆柱和球的实物与图形,建立空间观念。
在教学信息和感知材料的呈现上,我选用多媒体课件、各种立体模型、学具,等,来作为这节课的教具和学具。
接下来我来说一说本节课的教法与学法:新课标还强调:要让学生从自己已有的生活经验出发,亲身经历、体验、探索,将实际问题抽象成数学模型,并进行解释与应用的过程,体验——就成为新课标的重要理念之一,所以,在教学中,我安排学生在看一看、摸一摸、说一说、玩一玩、这些活动中来亲身体验知识形成的过程,我综合运用启发式教学法、情景教学法,尝试教学法、活动教学法等,来促进学生对新知的建构,在合理选择教法的同时,我还注重对学生进行学法的指导,使学生不仅学会,还要会学,在本课的教学中,我融观察操作、自主探索、合作交流等学习方法为一体,培养学生的自主学习、探究学习和合作学习的能力。
基于以上的理解我们将本课的教学设计为五个环节:
第一个环节:创设情境,激发兴趣激趣导入
(课件播放导入环节)
师:今天的数学课我请来一位朋友,瞧!它来了?(展示机器人)
师:是啊,这么漂亮的玩具机器人就是由平时许多废弃的物品拼成的,这就是变废为宝,这不仅让我们有了漂亮的玩具,更做到了“废物利用”。为环保贡献了一份力量。不知不觉我们成了“环保小卫士”真是一举多得。
这里用拼装机器人来激发学生的兴趣,还渗透环保知识,使学生有一种亲切感,并能感受到数学来源于生活,生活中处处有数学。
第二个环节:组织活动,探索新知
这个环节是课堂教学的中心环节,新课标强调:要让学生在实践活动中进行探索性的学习,根据这一理念,我设计了三个活动,让学生在体验中学习,在学习中体验。
1、分一分
小组活动,把形状相同的物体放在一起。
(课件)师:叮叮要考考我们,他说:师强调:把形状相同的物体放在一起,请小朋友合作分一分,动手吧!
2、揭示概念。
待学生分好类后,教师利用多媒体课件直接把物体形状抽象成图形,并揭示各种图形名称,
经过第一个活动,学生有了一些感性的经验,这时教师揭示名称,出示一般模型,帮助学生将感性认识抽象化。
3、操作感知特征。初步建立空间观念
(1)让学生看一看,摸一摸,玩一玩这些实物,然后用自己话说一说各种图形的样子与同桌交流。
这里我采取让学生先独立思考,然后再同桌交流的形式进行,我会给学生充分的时间,希望他们通过动脑、动手、动口来亲身体验,
(2)在班上汇报交流。
学生在汇报时有的说了(播放视频)
这里,我想通过摸得活动,让学生体验这几个面都是特点,
(3)让孩子在看一看、比一比、摸一摸、说一说等活动中找到长方体与正方体的相同点一不同点;发现圆柱和球的共同点和区别点,在动手操作实践中直观感知长方体和正方体不能滚动、圆柱和球能滚动等特征。
前面的小组活动学生以实物和模型为研究对象,,经过认真观察,亲自去摸一摸,玩一玩,对几种立体图形有了比较多的感性、直观的认识然后和同学的交流即使学生在交流中得到互补,又培养了学生的合作意识和能力,还培养、锻炼了学生的表达能力,又有利于丰富对这些立体图形的认识。
让学生在游戏中体验图形特征,加深对图形特征的记忆。
游戏(1):找朋友
分别请4位同学手执长方体、正方体、圆柱、球的图形嘴里说儿歌:找啊找啊找朋友,我是长方体,我的朋友在那里?其它学生拿出让学生拿出相应的实物,彼此辨认谁拿错形状了。用游戏调动学生参与的积极性,使学生快乐地学习,对几种立体图形的特征有更丰富的体验。
两人游戏(2):你摸到的是什么?
一人蒙上眼,摸一摸别人给出的一种实物,判断它的形状。
这一组活动的目的是帮助学生在头脑中建立四种立体图形的表象,培养学生的空间观念。
笑笑、淘气、机灵狗在山下游玩,山脚下有各种形状的建筑材料,他们一路高歌来到了山上,山上的风景太漂亮了,有野花,有蜜蜂,还有飞舞的蝴蝶,他们商量在山上建造一座小房子。回到山下,笑笑和淘气找来了一只长方体的箱子,往里面堆放了砖块,两人抬着气喘吁吁的往山上走,“哎哟!哎哟!”快抬不动了,他们只好放下来歇歇。机灵狗推着一只球在旁边滚来滚去,笑笑和淘气看看机灵狗这么轻松,决定想办法,他们决定给箱子装上轮子,淘气拿来正方体一装,推一推,推不动,好不容易推动了,箱子里的东西都跳出来了。机灵狗把球送过来了,两人把球装上去,车子摇摇晃晃,方向不好控制。
淘气和笑笑又在想办法,找来了圆柱体的轮子装上,推一推可轻松了。他们轻松的推着车子来到了山上。来到了山上,笑笑和淘气开始建房子,他们用长方体和正方体的砖砌墙,用圆柱体的木材做房粱,很快一幢漂亮的房子建好了。智慧爷爷过来了,他夸淘气和笑笑聪明能干,大家尽情的玩着,享受着劳动的收获和快乐。
1、师:听了这个故事,你想说什么?(长方体、正方体、圆柱、和球在生活中的作用可大了。
2、说说下面物体的形状
3、让学生说一说日常生活中见过的形状是长方体、正方体、圆柱和球的实物。
第五个环节:总结反思,深化认识
今天我们学习认识那些形状?(长方体、正方体、圆柱体、球体)它们分别有怎样的特征?我想通过这个环节来及时反馈本节课的教学效果,引导学生说出这几个平面图形的基本特征。还有一首好听的儿歌,我们来念一念,回到家里把这首好听的儿歌念给你爸爸、妈妈听听。(课件)
②、唱儿歌
圆圆滚滚圆柱体,正正方方正方体,长长方方长方体,骨碌
骨碌是球体,谁最有用比一比。长方体,来做墙。正方体,
来做窗。圆柱体,做屋梁。圆圆球体来装饰。面包房子真漂亮。
在课程结束时,把所学的图形特点编写成一首儿歌,让学生在歌声中结束课,这样,不仅帮助记忆图形特点,也增加的知识的趣味
小学一年级数学说课稿冀教版篇六
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小学一年级数学说课稿冀教版篇八
《认识图形》这部分内容,是学生在认识了立体图形的基础上,进一步认识平面图形,为以后学习更深层的几何知识打下基础。教材体现了从立体到平面的设计思路,注重让学生通过操作活动体会面与体之间的关系。
教学目标:
1、知识目标:感知长方形、正方形、三角形和圆的特征,能辨别出这四种平面图形,体会“面在体上”。
2、能力目标:通过实践活动,初步培养学生的操作、观察、表达及思维能力和应用知识解决新问题的能力。
3、情感目标:让学生感受到数学知识与生活息息相关,激发学生的学习兴趣。
教学重点:感知这四种平面图形的特征,并会辨认。
教学难点:体会“面”在“体”上。
教学准备:多媒体课件、立体图形实物若干、平面图形若干、白纸、彩笔等。
学生在一年级上学期已初步认识了立体图形,有了一定的动手操
作能力及合作意识,所以这节课我将以“自主学习、合作探究、精讲释疑、训练检测”四环节教学模式呈现教学内容。融观察、操作、交流、合作等学习方法为一体,让学生在操作中体验学习。
为了体现学生是学习活动的主体,我以学生的学为立足点,设计了如下教学流程。
(一)创设情境,激趣感知
通过课件出示一个由一些立体图形拼成的机器人,目的是引起学生的学习兴趣,为新课做好准备。
(二)师生互动,探究新知
这个环节是本节课的重点,也是难点。为了达到新课标强调的“让学生在实践活动中进行探索学习,在体验中学习,在学习中体验”的目的,我设计了以下三个活动。
1、帮新朋友取名
2、给新朋友找家
在这个环节中,我以学生为主体、教师为主导。让学生通过动脑、动手、动口来亲自体验从体上找面,体会面在体上。通过摸的活动让学生知道面都是平的。然后通过观察课件:面从体上滑下,加深学生对面在体上的理解。突破本课的难点,切实反应“学数学”不如“做数学”的理念。
3、新朋友自我介绍
这个环节我让学生以小组为单位讨论交流:假如你是这些图形,怎样向大家介绍自己呢?我这样做充分发挥了学生的主体作用。通过合作交流抽象出四种平面图形的特征,突出本课的重点。
(三)、联系生活,深化新知。
数学知识来源于生活,并服务于生活。为了将数学课上的图形与生活中的物体融合,加深学生对图形的认识,我设计了这样的活动:生活中,你还在什么地方见过这些图形呢?通过找图形让学生体验到,这些图形在生活中广泛的应用,增进了学生对数学价值和作用的认识,同时渗透了交通安全教育。
(四)、趣味练习,拓展新知
我通过让学生找、涂、数、拼等多层次的练习,巩固学生对本节课所学知识,训练他们的数学思维,发展学生的创新能力,提高知识应用能力。
1、教材37页练一练第一题,以游戏的形式进行,先指名学生蒙上眼睛摸一摸、猜一猜,再连一连。
2、第2题涂一涂,第5题数一数。加深学生对平面图形的认识。
3、拼一拼,在动手操作中发展学生的创新能力,让学生感受到数学美,几何美。
平面图形
长方形 正方形 三角形 圆
小学一年级数学说课稿冀教版篇九
分类和比较是重要的数学思想方法,也是学生学习其他数学知识的基础。本课教学以“帮妈妈放衣服”为主情境,通过妈妈与小朋友的对话,引发学生利用生活经验,学习比较“厚薄”,同时根据图中提供的花瓶、琉璃球、瓷马等物品还可以比较“长短”、“多少”、“大小”、“轻重”、“粗细”、“高矮”等。通过“在情境图中找一找,比一比”,让学生自己寻找可比的对象,选择比较的标准来“比”,给学生较大的自由发挥空间,体现“以人为本”、“以发展为宗旨”的素质教育新理念和目标。
1、 知识与技能
(1)、通过观察、操作等活动,使学生学会比较事物的多少、大小、轻重、高矮、长短、远近、宽窄、粗细、厚薄等。
(2)、让学生在比一比的过程中形成初步的观察、分析、比较能力。
2、 过程与方法
(1)通过观察、操作等活动在教师的引导下,使学生能在日常生活中发现并提出有关“比较”的简单数学问题,能初步汇报和交流自己的想法。,
(2)充分关注学生的学习过程,对积极参与、勇于交流的行为给予充分的肯定和表扬。
3、情感、态度与价值观
使学生经历比较的过程,感受数学与生活的密切联系,对身边与数学有关的事物产生好奇心和兴趣。
重点:通过观察、操作等活动,使学生学会比较事物的多少、大小、轻重、高矮、长短、远近、宽窄、粗细、厚薄等。
难点:让学生在比一比的过程中形成初步的观察、分析、比较能
1、说学情
根据日常的生活经验,学生对比较事物的多少、大小、轻重、高矮、长短、远近、宽窄、粗细、厚薄等,已经有了一定的基础,教学中注意引导学生考虑比较的多种方法。
2、设计理念
本着让学生学习身边的数学,学习生活中的数学的理念。设计了一定要让学生在自己的亲身经历中感悟、体会、认识。基于这样的理念,设计了一个个游戏,让学生去动手实践,感受数学知识就在身边。
3、教具准备:多媒体课件、气球、弹力球
师说上句,生对下句。
我说大,我对小;我说高,我对矮;我说低,我对高;我说长,我对短;我说薄,我对厚;我说轻,我对重;我说宽,我对窄;我说远,我对近……
热闹的师生互动的对口令游戏,充分调动学生学习兴趣。对口令的内容紧扣本课知识点,便于学生感知、理解,为“比一比”的学习做好铺垫。
一、情境导入。
1、教师请班里一名比较高的同学与自己合作比一比个子。得出老师比同学矮的结论。
2、再请两个同学与第一个同学比个子,分别得出结论。
3、引出课题。这些结论都是通过“比一比”得到的(板书:比一比),今天我就来研究“比一比”,看通过“比一比”的活动,还能知道些什么?
【设计意图:从学生身边的生活小事引出“比一比”的学习,使他们切身体会到数学来源于生活。教师民主地参与到学生活动中去,和学生打成一片,教师以一名合作者的身份提出自己的“看法”,鼓励学生大胆运用自己的生活经验进行反驳,培养学生敢于发表自己见解的精神,充分调动学生研究“比一比”问题的积极性。】
二、引导探究。
1、整体感知情境图。(课件出示情境图)
师:仔细观察,说说图上都有什么?
学生们通过观察说出画面中左边有挂衣橱和存衣柜,放有爸爸、妈妈和小明衣服;右边是博古架,摆放着瓷马、花瓶、琉璃球等。
2、比多少、厚薄。
(课件播放)小明说:妈妈的衣服真多呀!
师:你和小明的看法一样吗?你怎么知道的?
(多媒体突出放大存衣柜,便于学生观察。)
学生发表自己的意见,可能出现以下几种情况:
(1)数一数妈妈的衣服有11件、小明的衣服有4件,所以妈妈的衣服比小明的多。
(2)妈妈的衣服比小明的衣服厚,所以妈妈的衣服多。
(多媒体演示比厚薄的过程)……
小结:同学们用了不少好方法比较出妈妈的衣服最多,通过“比一比”,我们还可以发现许多问题呢。
3、比长短。
师:秋天到了,天气凉了,妈妈准备了三件外衣挂在衣橱里,(多媒体突出放大挂衣柜),比一比,你发现了什么?
学生先独立思考,然后小组交流讨论并在全班汇报。
学生们会出现许多不同的结论,如:妈妈的衣服比小明的衣服长;小明的衣服比妈妈的.衣服短;爸爸的衣服比小明的衣服长;小明的衣服比爸爸的衣服短;妈妈的衣服比小明的衣服长,比爸爸的衣服短;爸爸的衣服最长,小明的衣服最短……对于能用多种标准进行比较的小组进行表扬。
小结:比较的时候一定要确定谁跟谁比,比的标准不同,结果也会不同。
3、你还能比什么?
仔细观察情境图,小组确定研究内容,选择一样主题图中的一件物品,合作进行比较研究。
小组汇报,其它组补充、评价。
小组可以选择琉璃球比较大小、轻重等;可以选择瓷马比较高、矮、多少等;也可以选择花瓶比较胖瘦、高矮等。
小结:(根据小组合作学习情况进行评价。)
【设计意图:自主探索与合作交流是学习数学的重要方式。教师先带领学生充分感知情境图,说一说看到了什么,由“妈妈的衣服真多呀,你也这样认为吗”这个问题,激起学生运用生活经验进行自主探索的兴趣。教师根据学生的年龄特征,采取由扶到放的方式帮助学生进行小组合作学习。先是领着学生比较衣服厚薄,再半放给小组交流比较衣服长短,最后通过“还可以把什么东西比一比”,让小组自选研究题目,进行比较,这样一步一步引导学生进行小组合作学习,通过小组合作,互相补充、互相启发,使他们对新知识得到比较清晰、全面的认识。】
三、“闯关”巩固。
第一关比多少、厚薄(多媒体出示第23页第1题)
师问:哪边的书最多,哪本书最厚?
学生独立思考完成。
第二关比轻重(第24页第2题)。
用多媒体模拟天平称量水果的过程,
学生独立思考后判断轻重。
说说理由。(学生可以结合压翘翘板的生活经验直观感受天平杠杆重的一端下沉,轻的一端上翘的原理。)
【设计意图:通过多媒体演示,变教材的静态呈现为动态呈现,引起学生对已有的生活经验感受,从而更直观形象的感知天平称重的有关原理。】
第三关比手的长短(第24页第4题)。
演示活动:教师演妈妈,大同学扮演“我”,小同学扮演“弟弟”,比手。谁的手最长?
【设计意图:结合自主练习中的的插图在课堂上组织分角色表演演示活动,紧紧抓住了学生们的注意力,符合儿童欣赏、认知特点,可以更好的帮助学生解决问题。】
第四关:实践应用活动:谁哪合适?
1、出示一个气球和一个弹力球。
师:请你猜一猜哪个球重?哪个球轻?
2、学生们掂一掂、试一试后,说说实际比较的结果。
【设计意图】:先让学生猜测一下哪个球重,哪个球轻?熟悉这两种球的孩子会根据自己的生活经验很快判断出弹力球比气球重,对与没有这种生活经验的孩子教师要组织他们亲身试一试,体会大得物体不一定重,小的物体不一定轻的辨证思想。这是一道综合性较强的开放题,一定要留给学生充足的空间在组内交流各自的想法。】
第五关:实践拓展活动
找一找,生活中、教室里还有什么可以比的东西,小组合作找一找、比一比、说一说。
小学一年级数学说课稿冀教版篇十
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