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。相信许多人会觉得范文很难写?以下是我为大家搜集的优质范文,仅供参考,一起来看看吧
你有几辆车篇一
义务教育课程标准实验教科书(北师大版)一年级上册第23——24页。
通过解决有几辆车这一问题,初步感知从不同的观察角度出发,会列出不同的算式,初步体会“加法交换律”的含义
过程与方法:通过解决这一数学问题,初步感知从不同角度出发。
培养学生认真细致的观察能力和推理、概括能力
从不同的观察角度出发,会列出不同的算式]
初步体会”加法交换律“的含义
教具准备:小汽车、挂图、皮卡丘、红花、卡片
一、创境准备
1、(出示淘气和笑笑图片)你们认识它吗?喜不喜欢他们?今天来到我们的课上和我们一起学习?
2、师:他们是一个认真观察、爱动脑筋的小精灵,它在上学的路,经过了一个停车场,发现了一个数学问题,就把这个数学问题带来与小朋友们一起分享,让我们赶快来看一看什么问题,淘气和笑笑是一年级学生非常喜爱的好朋友。课一开始就把它作为学习伙伴引入,激发学生的学习兴趣。)
二、探究发现(教师把讲台桌布置成停车场)
㈠、引导理解加法交换律的含义
1、师:通过观察你看到了什么?
生:停车场的左边有3辆车,右边有2辆车:或者右边有2辆车,左边有3辆车。
师:想提什么数学问题?
生:停车场一共有几辆车?
师:怎样列算式?
师指着算式中“3、2、5”各表示什么?
师:仔细观察这两个算式,你能发现什么?
生:都是等于5,不同的是交换了3和2位置
生:所以我们说3+2=2+3
2、请学生用学生代替小汽车摆一摆。
(从实际生活中的活动场面入手,让学生自己提出问题,解决问题,既提高了学生的提出问题的能力,又感受到数学与生活的联系,也较好地体现出学生学习的主体参与意识。)
二)、摆一摆
师:笑笑认真观察爱动脑筋,老师要奖给它小红花。(师在黑板上贴出3朵红花)。小朋友们也要向学习,你们能从这些红花中提数学问题吗?
1、指名回答后,让学生动手摆一摆,列出算式
师:小朋友们也表现得棒,老师也给小朋友们奖励红花。(师贴出3朵红花)
2、学生又根据教师贴的红花,说算式
(摆一摆的设计,教育了学生要做生活中的有心人,使学生进一步体例到数学就在我们身边,数学与 我们的生活密切联系)
(三)、试一试
⑴师引导生说图意
⑵小组合作完成
⑶全班交流
三、总结交流:通过你的学习,你在这节课中发现了什么?你能用自己的话说一说吗?
四、巩固练习
1、单项练习
⑴师:请小朋友们一起来拍手游戏。听清楚老师拍几下,然后你拍的和我拍的合起来要是
⑵如:师拍:×
生拍:××××
师:谁能根据我们拍的次数列成算式?
生:1+4=5 4+1=5
2、对比练习
教师把第25页中第2题的算式写在卡片上,师举卡片,生答
3、应用练习 师:今天淘气还给大家带来一些小精灵算式,你想上来摘哪道就摘哪道,拿到算式的学生进行比较,没拿到算式的同学做小裁判。(把第25页第3题写在卡片上)
4、请学生模拟表演第4题
5、引导学生理解图意后,独立列式计算全班交流
你有几辆车篇二
1、初步感知从不同的观察角度列出不同的算式。
2、进一步体会“加法交换律”的含义。
重点
体会和理解“加法交换律”的含义。
难点
理解“加法交换律”的含义。
教具
课件
电化教具
电脑
一、看一看:
(书p24)停车场里停了很多汽车,同学们看到汽车后谁能提出数学问题?你会怎样列式?然后在进行比较,发现规律。
3+2=5 2+3=5
3+2=2+3
二、摆一摆、试一试:
学生观察书中的图,鼓励他们根据图意提出问题。在解决问题时,教师可以引导学生列出两个不同的算式,并比较两个算式的异同,让学生直观的理解加法交换律的含义。
试一试,让学生独立完成,注意引导学生提出问题,并能清楚的表达图意。
三、练一练:
1、(书p24)让学生先动手摆一摆,再做练习。
2、让学生独立观察书中的图,理解图意,列式解决问题。学生可以列出不同的加法算式:2+3=5,3+2=5,1+4=5等,只要学生能说出合适的理由,教师都应该给与肯定。
教学过程
3、游戏:让10名学生排成一排,面向在座的学生,然后提问:**排第几个呀?(学生会有两种回答,让学生明确回答从哪面数的。)
4、出示小鸟的图片,让学生根据图片编故事,同桌之间相互合作,完成p25的第5题。
板 书 设 计
加 法
3+2=5 2+3=5
3+2= 2+3
教学
后记
少部分学生没有按照图的意思列出算式,应给予及时的纠正。
你有几辆车篇三
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本课内容在教材第24-25页。主要内容:“摆一摆”,“试一试”,“练一练”;“加法交换律”的.含义。
1、使学生初步感知“两个数相加,交换加数的位置,得数不变”的加法交换律。
2、使学生初步学会从不同角度观察事物,渗透辩证统一的思想观念。
3、通过情景活动,培养学生提出问题、解决问题的能力和语言表达能力。
4、通过动手操作、合作学习、互相交流等形式使学生感知“加法交换律”。
5、让学生亲身从不同角度观察同一事物、提出问题、发现规律等过程,培养学生学习加法的兴趣和信心。
通过仔细观察,动手操作,进一步理解加法交换律的含义。
根据具体情景,灵活列出不同的加法算式。
1、第24页主题图、“试一试”图
2、贴花4朵。
学具
一、复习
1+2= 2+1= 1+3= 3+1= 2+3= 3+2=
4+1= 1+4= 5+0= 0+5= 2+2=
二、活动过程
1、故事引入(回答好的小朋友奖励小红花)
现在生活越来越好了,买汽车的人也越来越多了。这不,体育中心又要开“汽车博览会”了,笑笑和淘气也去了,而且他们还发现了有趣的数学问题,是怎么回事儿呢,我们也一起去看看吧。
出示主题图
师:他们在干什么呢?
让学生在认真观察图意后回答。(板书课题:有几辆车)
师:支持笑笑的同学请举手
你能帮她说说理由吗?(板书:3+2=5)
师:支持淘气的小朋友举手
你也能说出理由吗?(2+3=5)
师:他们倒底谁正确啊?为什么?
多请学生回答,最后总结板书。(板书:3+2=2+3)
2、请1个男同学4个女同学站到教室中间,让学生题出数学问题,并列式解答。(左边和右边的小朋友会有不同的算式出现,再次领会加法交换律)板书算式
师:你们从刚才的活动中发现了什么?有哪个小朋友想告诉大家?(两个数相加,交换加数的位置,得数不变)
3、游戏
接下来老师还想跟小朋友做一个游戏,我出1朵小红花贴在黑板的一边,再请2位得到小红花的小朋友把你们的小红花贴在一起,然后请一个小朋友来说一个问题。
我可以这样列算式:1+2=3
你还可以怎样列算式?
再来贴上1朵和3朵小红花,同上完成。让学生明白一个图我们是可以写出两个加法算式的。
完成书上摆一摆
4、活动
下面请前后两个人一组,也像我们这样做游戏,一人摆学具,两人各说一个加法算式。
当学生提出两边各摆2个,列出的两个算式一样时,老师要说明:两个算式相同时,只需列一个算式.
四:我想试一试
1、出示“试一试”左图。引导学生理解题意,提出加法问题,并列出算式。(可与同学交流)
2、出示“试一试”右图。
他们俩发现了这么多的加法问题,非常高兴,想把今天看到的都画下来.他们拿出蜡笔,发现了什么?
教师:他们俩被难住了,要列出两个加法算式,该怎么列呢
3、听回答,对学生列出的正确算式,要进行肯定和表扬。
(活动:拍拍手)
五:大家动手练一练
1、师出示手指,请学生列式。然后指导完成练一练第一题。
2、学生理解题意后独立完成25页第2、3题。然后汇报
3、动起来
找10名学生台站成一排。提问:共有几个小朋友?
指定其中1人,提问:她排第几个?你有不同意见吗?
指定队伍中任意1人,提问:我排第几?
引导学生总结:同一个问题,从不同角度看,可以有不同的结果。
4、完成练一练第5题,提出要求:请大家独立看图,提出问题,在书上列出算式,然后大家交流。
故事引出的思考并小结:
古时候,有一个人养了一群猴子,他给每只猴子早上吃三个桃子,晚上吃两个桃子。有一天,这群猴子闹起来了,说:“主人,你为什么晚上少给我们吃一个呢?”,于是主人想了想说:“嗯,那这样吧。早上吃两个桃子,晚上多一个,吃三个桃子。这样总行了吧。”猴子都高兴的点头说:行,行。
同学们,听了这个故事,你有什么看法?
学生倾听故事,思考故事当中有什么数学问题。
通过听故事,激发学生的学习兴趣,并在故事中领悟加法的交换律。
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