小学二年级数学说课稿(16篇)
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小学二年级数学说课稿篇一
1、生动的情境不但可以调动学生学习的兴趣,而且为学生学习乘法提供了丰富的现实情境模型,并让学生认识到,同数连加的情境在生活中是广泛存在的。刘老师充分挖掘的课本的情景导图,从图中引出本节的数学知识内容,一方面锻炼学生观察的能力,另一方面培养学生提出问题分析问题和解决问题的能力,在课堂设计上为后面引出乘法做了充分的铺垫。
2、本节课的重点是理解乘法的意义,并会根据加法算式写乘法算式和读乘法算式。难点是由加法算式写乘法算式的方法。
那么,在新知识的学习中刘老师不断重复连加的特点,反复让学生数加数的个数,采取逐步开放的形式,让学生将“求几个相同加数的和的情境与算式用“几个几”的形式表征出来”。突出强调了乘法意义的本质。一是加法算式与乘法算式到底有什么联系?即如何去确定乘法算式中的两个因数(初步领会乘法的意义)二是什么样的加法算式才能写成乘法算式(深入领会乘法的意义——只有相同的数连加才能写成加法的简便计算形式,即乘法算式)。
刘老师一次次在数中提示学生的一个作用是防止学生在书写乘法算式中避免写错乘数,另一个作用就是让学生反复巩固乘法算式中的两个乘数是如何得来的,帮助学生理解和掌握。细微之处讲的非常到位。
3、整堂课的设计安排比较合理,层次清晰,设计体现学生逐层深入的认知规律和知识发展的规律。每一个教学环节都能体现出重点知识,教学策略应用相对熟练,很自然的从加法过渡到乘法,乘法的书写、意义和演练、提升训练,每个衔接都充分发挥了学生的主观能动性,课堂中处理学生的问题及时到位,遇到学生不会的又返回头从加法中寻找,一直围绕着主题解决问题。这也是提高数学学习有效性的重要举措。
4、注重了思维过程的展示。数学的本质是发展学生的思维。怎样发展其思维?在哪里发展思维?在哪里培养思维能力?课中给了我们很多答案。老师在提问后,比较关注学生的答案,如一个学生答到了3+3还可以写成2×3,老师赶紧追问:“你是怎么知道的?”6个3相加学生说可以写成6×3,老师认真问到了:“你是怎么想的?为什么可以写成这个样子?”等等。我认为,只有学生将自己对新知的理解用自己的话表达出来了,才说明他是真正的对所学知识理解透了,否则就是一知半解,久而久之,就是不知不解。老师对这个细节的重视,也是关注数学学习有效性的愿望之一。
5、练习上也不断出花样,从不同的角度让学生反复训练和做题,从小组中的进行比赛演练,活跃气氛,很大程度上提升了学生的参与度,结合实际操作练习,动手做一做,从做中学,丰富了课堂的内容,让学生体会到乘法算式的意义,练习创新能力。
1、对于回答错的学生可以多说说为什么,让其他学生帮助解决问题后再让他说说看,充分发挥开始时反复强调的方法,改正学生的错误观点,掌握本课的内容。
2、在乘法算式中老师可以举一些相同结果的式子,如3个4相加是3×4=12,而4个3相加是4×3=12,两个意义是不同的,可以让学生对比体会,从而再起强调的本课的重点,了解到两个乘数的意义,或者给出一个乘法算式让学生自己编一编这个算式代表的意义和问题,反过来考学生。
3、动手操作更应重视对数学问题的思考。课中教师虽讲明了要求后再做,这是对动手有效性的关注,值得我们去借鉴。但你的要求中唯一缺少就是“摆后想一想怎样求一共用了多少根小棒?”这一数学问题。好像使操作活动显得有些多余,价值有些欠佳。
4、“相同数连加”这一重要条件在改写成乘法算式中的重要作用突显得不够,也就是加法算式到底与乘法算式之间有什么样千丝万缕的联系,学生尚不明确。教师刚好做了一件本末倒
小学二年级数学说课稿篇二
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小学二年级数学说课稿篇三
《分香蕉》是北师大第三册第四单元的第4节新课,通过前面3节“分桃子”、“分苹果”、“分糖果”内容的学习,学生已经进行了大量的等分活动,积累了一定的经验。这三节平均分的活动,是在学生还不知道除法的情况下,从已有的生活经验出发,在操作水平上解决除法问题的过程。这节课是在学生已经积累了一些平均分的经验基础上开始认识除法的,从学生熟悉的“分香蕉”的具体情境,抽象出除法算式,从而理解除法与平均分的联系,体会除法运算的意义。同时,介绍除法算式各部分的名称,进一步用除法算式表示并解释平均分的具体过程。
1、使学生从“分香蕉”的具体情景中,抽象出除法算式,并理解除法与平均分的联系,体会除法运算的意义;
2、掌握除法算式的读法、写法,并认识除法算式中各部分的名称;
3、学会用除法算式表示并解释平均分的具体过程和结果;
4、培养学生动手操作能力和初步抽象概括能力。 教学重点:理解除法算式的意义,会将分的过程用除法算式表示。 教学难点:理解除法算式的意义,建立除法算式与平均分之间的联系。 课前准备:小棒20根、投影仪、课件等。
学生是数学学习的主人,教师是数学学习的组织者、引导者与合作者。基于这样的认识和本课学习内容的特点,首先要考虑的就是如何突出学生的主体地位,使他们成为课堂的主角,主动投入地学习。在设计教学时我主要突出两点
1、通过让学生动手摆一摆、填一填、分一分、圈一圈、画一画等,帮助学生通过大量的感知,形成表象,在此基础上进行抽象概括,初步建立等分活动与除法的联系,达到教学目标,突破教学的重难点;
2、课前了解到学生对这部分知识在生活中已经知道了一点,但有不全面,根据学生的个人知识和直接经验,所以在教学除法算式的意义、读法等,我决定大胆放手让学生来说出新课的内容,教师只是适当的指导、点拨。这样既可以激发学生学习数学的积极性,又能很好地发挥学生的智慧,学生的兴趣就很浓厚。
(一)、创设情境、故事引入 (课件出示情境主题图) 师:你们瞧,这两只小猴皱着眉头正在发愁呢!猜猜它们是为什么事发愁?(学生自由猜一下)对啊,它们正在为分面前的香蕉发愁呢。猴哥哥和猴弟弟谁也不肯吃亏,想分的公平一些,你们说怎么分才好呢?(引出平均分)
[设计意图]:利用学生喜欢的动物故事引入新课,学生有了生活经验,既喜欢,又能很好地发挥自己的智慧,学生的兴趣就很浓厚。 (二)、动手操作,探索新知:
1、平均分12根香蕉 (1)、分一分: a、用12根小棒代替香蕉平均分成2份,请你分一分。 b、你能用一句简单的话把刚才分的过程和结果说一说吗? (把12根香蕉平均分成2份,每份6根)
(2)、如果又来了一只猴子,你怎么把这些香蕉平均分呢?分的过程和结果又怎么说呢?独立分——同桌互相说。 (3)、你还会把这12根香蕉平均分成几份?独立分——自己轻轻说——全班交流
2、认识新朋友
(1)、师:像这样“把12根香蕉平均分成2份,每份6根”可以用除法算式来表示。你知道怎么写吗? 12÷2=6(根),12、2、6分别表示什么?÷表示什么意思?这个算式表示什么? 这个算式你会读吗?
(2)、那么“把12根香蕉平均分成3份,每份4根”的除法算式怎么列呢?你能说说它各部分的含义吗? 下面的几种平均份又怎么列除法算式?请你写在本子上。
(3)、观察这几个除法算式,你发现了什么?
(4)、每个小朋友都有自己的名字,除法算式这几部分也有它自己的名字,谁能来当小老师说一说?
[设计意图] 通过帮猴子分香焦把学生吸引到数学的活动中来,然后通过学生自己动手分一分,说一说等活动,使学生进一步理解了除法的意义,掌握了平均分与除法算式的关系,并会读、写除法算式,整个活动过程教师充分让学生自己去探索,尊重和信任学生,为学生充分参与到学习活动中提供了时间和空间。
(三)、游戏:闯关 师:你们帮小猴解决了烦恼,他们非常感谢你们呢!想邀请你们和它们一起去闯智力关,你们愿意去吗? 1、看图列式(课件)。 2、说一说,分一分。(看课件说,在练习纸上分一分) 看算式分一分。 10÷5=( ) 15÷3=( ) 20÷4=( ) [设计意图]:创设了“闯关”这个游戏,让学生在竞赛的气氛中对学习的知识进行巩固练习应用。说一说、分一分这题是看算式让孩子分图,是个逆向思维,有一定的难度,激起孩子的挑战欲望,使学生进一步理解除法算式和平均分的`联系。
(四)、课堂总结:
1、今天你有什么收获?和大家分享一下。 (机动)
2、排座位:马上就要召开校运动会了,准备邀请18位二年级的家长来观看,校长把安排座位的工作交给我们班去完成,你认为座位怎么排比较合适?说说你的理由。
把12根香蕉平均分成2份,每份6根12 ÷ 2 =6(根)
把12根香蕉平均分成3份,每份4根12 ÷ 3 =4(根)
把12根香蕉平均分成12份,每份1根 12 ÷ 12 = 1(根)
… …被除数 除号 除数商
小学二年级数学说课稿篇四
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小学二年级数学说课稿篇五
认识路线图是苏教版国标本教材二年级下册第六单元确定位置中的一个教学内容。在学习本课之前为学生已经认识了东、南、西、北、东南、东北、西南、西北这八个方向,会用这些表示方向的词描述物体所在的位置。部分学生还曾在生活中见过,但通过课前调查发现他们对于路线图并不了解。
通过这节课的学习要使学生在观察公交车站牌、游乐场路线图、城市平面图等活动中,认识路线图,并会运用方向描述行走路线。在情感态度方面,要使学生在合作交流的过程中,获得成功的体验,树立学好数学的信心。在数学思考方面,要使学生在观察、解决实际问题的过程中,感受数学与日常生活的密切联系,培养运用生活经验帮助思考的意识。
本节课的教学重点是在实际场景中运用八个方位词描述行走路线,教学难点是运用知识解决生活中的实际问题。
为了突出教学重点,解决教学难点,培养学生运用意识,我对教材做了以下处理。
在新授环节,教材呈现的公园里的四季亭、盆景园等场景是学生不熟悉的,我把公园平面图换成学生喜爱又常去的游乐场平面图,唤起他们的生活经验。我首先利用多媒体在欢快的音乐中展示一幅幅游乐场里人们欢快游玩的图片,视觉和听觉的强烈冲击一下子吸引住学生的注意,并以此很快引入新课。接着我借助课件指导学生观察平面图,使学生了解要描述路线图,就要知道游玩景点、明确方向再确定路线,通过认识小明和小芳的游玩路线帮助学生学会用八个方位词描述路线。对于个别描述有困难的学生可以借助方向板描述方向。
在练习环节,我为了让学生感受到路线图对解决生活实际问题的直接意义和作用,我拍摄了汽车上的行车路线图、街头路牌分别添加在想想做做第3题和第5题的前面。同时,在试上中发现学生对于书上的城市平面图没有感受,因此我把这幅平面图改成了学生熟悉的学校周围情况平面图,使学生体会到了生活与数学的密切联系,学得也会比较有兴趣,也让学生在模似情景中学会解决生活中的实际问题。
对于生活中遇到的环形车问题,由于学生并不都具有这方面的乘车经验,而仅根据教材中的简单示意图学生很难理解环形车的概念,因此我把这题融入第5题的城市地图中。先让学生观察站牌,初步明白环形车的特点,再在地图中演示行车路线,使学生更直观的感受和理解环形车概念。
新课标提倡学生学习中的自主探索、合作交流的学习方式,本节课我努力为学生创造合作交流的机会。我采取了小组讨论、同桌交流的学习形式。小组活动是在新授环节,学生初次学习描述小明游玩路线时。小组交流的活动形式让学生放松地畅所欲言,各人结合自己已有的生活体验描述路线,学生在描述中相互补充,达到理解上的共识,并完善结论,再通过全班交流的形式寻找自己与他人在认识上差距。
在认识了公共汽车的路线图后,我按排了同桌互相提问的教学环节,充分调学生已有的乘车经验,学生的提问具有很强的现实性。如一个学生提出需要转车的问题。个别学生对转车有经验,班上出现了两种答案,这时我是引导者,点拨、引导学生选择更合理的路线。通过这样的提问和回答全班共享解决回答的策略,今后再遇到类似的问题就会自己解决了。
通过这节课学生学会了确定路线图的方法,并学会在实际生活中制定合理的路线,把今天学到的知识延伸到课外。
小学二年级数学说课稿篇六
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小学二年级数学说课稿篇七
《小熊请客》选自北师大出版社二年上册第二单元乘法口诀(一)的第六课时.4的乘法口诀。他是在学生学习了5、2、3的乘法口诀的基础上进行教学的,教材在这里用“小熊串红果串请客”这一情境入手,引导学生自觉经历用4连加的过程,为编4的口诀做准备。在推导4的乘法口诀时,采用实践探索法,让学生感知知识的形成过程,让学生学得有亲切感。在交流总结时,引导学生总结出口决特点。
根据本册教材的编写意图和特色,确立本节课的教学目标为:
知识目标:1、让学生利用4的连加和已学过的乘法口诀得出,经历4的乘法口诀的编制过程,理解和掌握4的乘法口诀,并理解每句口诀的含义。
2、能运用所学口诀,完成表内乘法的计算,并解决生活中的实际问题。
能力目标:引导学生探索规律,初步培养学生分析、综合能力;提高学生的计算能力。
情感目标:1、在数学游戏中让学生体会数学存在于生活中,从而强化学习数学的兴趣。
2、“乘法口诀”他是中华文明的一个瑰宝,可以说是中华民族聪明才智的结晶,他可以培养学生爱国之心及自豪感。
根据教学内容特点和学生的认识规律,创设“小熊请客”的情境,通过观察发现信息,表达信息,并借助乘法意义编制口诀,而且通过“开火车”和“对口令”等多种形式,观察学生记忆口诀的流畅性和了解口诀记忆的准确程度。同时在教学中,注意独立思考,小组交流的学习形式的交互运用,达到发展智力,培养学生有条理地思考问题的习惯和初步的推力能力的目标。
教学准备:小熊玩具、“小熊请客”主题图,试题卡、幻灯片、气球……
(一)创设情境
我首先拿一只玩具小熊让大家猜,并用小熊过生日用红果招待朋友的故事情境导入,使学生一开始就有快乐的心情步入课堂,然后我用大屏幕出示主题图,主题图色彩鲜明, 一定会让学生们兴趣盎然,并在以往的基础上,他们会很快去找主题图上的数学信息,并展示给同学们。他们肯定会说:小熊串的红果串,每串4个,他已经穿了2串,他还要串也一定是4个4个串的,当然在这里也有可能有的同学会把老师刚才所说的小熊过生日用红果招待朋友,小熊自己在家里串红果串等等,说得很完整,这时老师也不要怕耽误时间,让他说没关系的,这也是在培养学生的语文表达能力,这样做不正做到了各学科之间的整合嘛。此时,老师适时点播,小熊串一串需要4个红果,那么2串、3串……9串呢?这时教者可出示“9串需要多少个红果”的问题。
(二)合作探究,构建新知,编制4的乘法口诀。
1 用你自己喜欢的方式数一数9串需要多少个红果?
在这里学生可能会用很多的方法,如:(1)4个4个的数(连加)
(2)学生可能会运用学过的口诀把9串红果分“堆”计算:如:5串一堆(有20个红果),2串的2堆(每堆8个,2堆有16个)所以一共需要红果36个;也可以3串3串分成3堆,每堆12个红果,3堆一共有36(12+12+12)个红果。 只要学生说出理由,教者都要给以肯定,让学生从中得到发现问题解决问题的快乐,从而乐学、爱学,这正是新课程标准所要求达到的。另外这种方法,也让学生体验算法多样化,也能体会到运用已知去探索未知的思考方法。
2 自己完成填一填。同桌交流所填的结果的正确性。并试着编制口诀。教者可巡视及时发现问题,并对口诀编制有困难的同学及时提示,使他们利用已有的知识正确编制口诀。
3 汇报过程。说说你是怎样推导4的乘法口诀的。并填上结果及口诀。找出已学过的口诀,检验口诀编制的正确性。
4 怎样记住4的口诀,共同探讨方法,寻找捷径。在这里我会出一个问题:老师在做4×6时忘记口诀了,不知道得多少怎么办呢?让同学们帮忙解决,同学们一听,老师不会,让我们帮忙解决,多么荣耀!他会跃跃欲试,积极思考,他们会告诉你很多方法,如:(1)可以用连加法就能算出;(2)4×5得20,20+4不就是4×6的结果嘛?(3)可以4个3加4个3……最后老师可以小结:同学们真聪明,想出这么多好办法让老师做出4×6的结果,但是老师还要说,如果你记住了口诀会更快的做出来是不是?向上面的4×6,知道四六二十四一下子就写出4×6的结果了,所以我们一定要熟记乘法口诀,这样提高我们的计算速度和计算的准确性。下面我们用已学过的方式记口诀,(1)开火车记忆口诀(2)师生对口令(3)同桌对口令,而后教者可以出几道乘法题卡,以检验学生对口诀的掌握情况,教者在提问的过程中一定要做到心中有数,看哪个孩子问题较大,并在适当的时机给以弥补。
(三)随堂练习,巩固新知,提高口诀的应用能力。
1 组织学生分小组活动练习“说一说”数桌腿的活动,这个可以让学生亲自摸摸、数数强化对口诀的记忆。也让学生感受数学就在我们身边,生活中处处有数学。
2 完成21页的习题。
可以这样衔接:为了庆祝小熊的生日,小兔、松鼠、小狗和刺猬还拿来了好多各色的气球要送给小熊呢!他们都送了多少只呢?这时找到四名同学分别去这四个小动物,让他们找到自己送给小熊的气球。其他同学检验结果的正确性,让他们感受发现的喜悦。
而下面的2题是单纯的计算题,直接让学生做就不能激发学生的兴趣,可以设计让同学们进行夺气球比赛,3题是看图题,用大屏幕展示出来,要求学生不但说出算式,而且还要说出意义。从而培养学生说话的完整性及条理性。这道题可以设计成抢答题,哪一组的哪一个人抢答的最快就奖励哪一组两个气球,最后评选出气球最多的为优胜组,每人奖本一个。为了让1、2、3题衔接紧密可以这样说:气球终于都准确无误地送给了小熊,小熊非常感谢大家,他希望把气球送给其他的小动物们,于是,他提议,进行上面两项比赛。这个比赛不但激发学生的竞争意识,而且也培养人与人之间的合作意识。
21页下面的数学游戏,可以这样进入。 比赛结束,大家玩得正起劲,忽然发现主人公小熊不见了,只看见桌子上留了纸条,上面写道:走过迷宫,你就
小学二年级数学说课稿篇八
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小学二年级数学说课稿篇九
今天,我说课的内容是北师大版二年级第四册第44页至第 46页《1千米有多长》,我准备从以下这八个方面展开说课。
《1千米有多长》是北师大版小学数学二年级(下)册第五单元的内容。本单元是在学生学习了长度单位米、厘米的基础上,进一步学习其他的长度单位。在教学过程中,通过引导学生?结米、分米、厘米、毫米之间的关系,抽象出长度单位“千米”。“千米”这个长度单位比较抽象,教材通过三个步骤帮助学生体会1千米有多长:第一步:通过同学们手拉手站成一排,体会10米大约有多长;第二步:通过全班同学手拉手站成一排和100米大约要走多少步,体会100米有多长;第三步:通过10个100米跑道的长是1千米等场景,体会1千米有多长。在教学过程中,通过让学生拉一拉、走一走、想一想等这些简单的活动,真正体会到10米、100米的距离到底有多长。在进行认识“千米”教学时,充分联系前面100米有多长,10个100米长就是1千米,然后结合?校实际,学校操场的跑道有400米,那么2圈半就是1千米,使学生体会到在表示较远的距离时,要用“千米”作单位,并介绍怎样用字母表示以及千米与米之间的关系,联系生活实际,合理运用长度单位。
通过前面的学习,学生已经认识了长度单位:米、分米、厘米、毫米,以及它们之间的进率,多数学生能联系生活实际,合理运用长度单位。但“千米”这个长度单位比较抽象,学生学习起来有些困难。为了激发学生的学习兴趣,可以把学生带到学校的操场上进行教学,让学生实地拉一拉、走一走、想一想等活动,充分感知“千米”这一长度单位到底有多长;对于学困生,以和他们玩游戏的方式来引导他们感知1千米的具体长度,从多角度来激发他们的参与,给予他们激励性的评价语言,并让他们积极汇报自己的亲身体会,达到全员参与,共同提高的原则。
新课程标准在空间与图形中明确提出:在教学中,应注重所学知识与日常生活的密切联系:应注重使学生在观察、操作等活动中,获得直观经验。结合我对教材的理解和本班学生的实际情况,我拟订了以下教学目标:
1、知识与技能
感受并体验1千米有多长,知道千米和米的关系,学会千米和米的简单换算。进一步发展学生的空间观念和动手操作能力。
2、过程与方法
通过拉一拉、走一走、说一说、想一想、量一量等活动,让学生经历认识1千米有多长的过程,感受长度单位的实用性。
3、情感态度与价值观
体会长度单位与实际生活的联系,并适时渗透思想教育。
找准重难点是上好课的前提,我认为这节课的教学重难点是在活动中体验千米的含义,正确建立1千米的长度观念。
记录单、大屏幕
根据课堂教学应以“学生为主体,教师为主导”的新课程理念,本课教学采取“以学定教,顺学而导”的方法,根据学生学习的实际,灵活地组织教学环节,设计有效的教学活动,让学生在实践、探索、交流中学习。
教法:以学定教、顺学而导、复习引入、情景激趣、引导发现、学用结合。
学法:观察、想象、验证、类比推理。
通过对教材的分析,以学生发展为本的原则,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的过程中真正理解掌握基本的数学知识和技能、数学思想和方法,获得广泛的数学活动经验。因此我是这样设计教学过程的。(一)引入新知;(二)探究新知;(三)巩固新知;(四)拓展新知;(五)总结新知.
(一)引入新知
1、同学们,能说说我们已经学过哪些计量长度的单位吗?它们之间有什么关系?
2、谁能比划出1米的长度?
3、今天我们再来认识一下长度单位家族里的新朋友____千米。告诉老师,你们最想了解有关千米的什么知识?
(巩固旧知,激发学习新知的欲望)
(二)探究新知
1、测一测(在操场上进行)
⑴、同学们自由组合,手拉手站成一排,看一看几个人才能站成大约10米长。数清人数,并记录下来。
⑵、请同学们以刚才站成大约10米长需要的人数为单位,在操场上走一走,数一数10米大约有多少步,做好记录。
(把学生带到操场上测量,为感知1千米长度打下基础,同时也培养学生的动手操作能力)
2、想一想( 回到教室,先让学生汇报自己的步测结果)
?、通过刚才的活动,我们知道手拉手站成10米需要的人数,想一下,我们全班同学手拉手站成一排,够不够100米长?你认为多少个同学才能手拉手站成一排呢?
⑵、我们测量出10米大约走多少步,你知道100米大约需要多少步吗?1000米呢?
(通过这些简单的活动,让学生真正体会10米、100米的长度,进一步发展学生的空间观念)
3、算一算
⑴、如果我们学校的操场一圈是400米,算一下,沿操场走几圈的长度正好是1000米?
⑵、小结:沿操场走2圈半,也就是走1千米。1千米=1000米 千米也称公里,可以用字母km表示。
(结合生活实际,使学生体会到在表示较远的距离时,要用千米作单位)
4、填一填。
⑴、我们已经知道1千米有多长,你是否知道选择不同的交通工具走1千米分别需要多长时间呢?看图选择正确答案。(完成书中 46页填一填)
⑵、在生活中,你还见过哪些地方有千米的标志?学生回答后,大屏幕播放"你知道吗"
(加深对千米的认识,同时感受长度单位的实用性)
⑶、小结:千米常用来计量比较长的路程,比较远的距离。
5、估一估。
⑴、我们知道了1千米的实际?度,现在请你估计一下,从校门口出发到什么地方大约有1千米?
⑵、小结:1千米,我们大约走20xx步。课下,我们可以从校门口出发数出20xx步,看看你正好走到什么地方,与你刚才的估计是否相符呢?
(感受并体验1千米有多长)
(三) 巩固新知(大屏幕出示)
1、在( )里填上适当的长度单位。
a.沈阳到北京的铁路长8000( )。
b.青藏公路是世界上最高的公路,全长1943( ),平均海拔4000( )。
c.我国的长城是世界八大奇迹之一,它的总长约6700( )。
d.月亮绕地球每秒运行8( )。
(感受千米在日常生活中的广泛应用)
小学二年级数学说课稿篇十
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小学二年级数学说课稿篇十一
等边三角形是八年级数学上册的内容,主要内容是等边三角形的性质定理和判定定理以及判定定理的推理证明和初步应用。是学生学习了轴对称图形和等腰三角形有关知识后学习的,本课学习不仅是学生进一步认识特殊的轴对称图形——等边三角形,更是今后证明角相等、线段相等的重要工具。要求学生探索并掌握等边三角形的性质、判定方法。
建立初步的符号感,发展抽象思维。经过观察实验、猜想证明等数学活动,发展合情推理能力。
(1)了解等边三角形的概念。
(2)情感目标:激发学生积极参与数学学习活动的兴趣,培养学生良好的创新意识。
等边三角形判定定理证明。
(1)等边三角形判定定理的发现和证明。
根据“获得数学知识的过程比获得知识更为重要”的理念。我确定本课的教法为:探究发现法,即学生在老师的正确引导下,积极主动参与探索发现、归纳类比等数学活动获得知识。
“教学中让学生发现一个问题比解决一个问题更重要。”因而本课的学法指导是让学生在“观察——发现——论证——归纳”的学习过程中自主参与知识的形成的过程。从而培养学生探究问题,交流合作的良好品质。
《数学课程标准》明确指出:“数学教学是数学活动的教学,学生是数学学习的主人。”为能更多地向学生提供从事数学活动的机会,我将本节课的教学过程设为以下四个环节:
创设情景导入新课先借助多媒体展示一组图片。让学生观察实物图片,在众多图形中认识等腰三角形,辨认特殊的等腰三角形。揭示课题
2、合作交流探究新知:从实物抽象出等腰三角形、等边三角形的几何图形,并用课件展示图形。请同学思考下列问题:
问题1图中的等腰三角形有什么特殊之处?——学生回答后自然引出等边三角形的定义。
问题2等边三角形的三个内角有什么关系?让学生根据定义画一个等边三角形,用量角器度量三角形内角的角度进一步验证这个结论。
问题3我们从边、角两方面描述等边三角形的性质,那么我们要判定一个三角形是等边三角形,从边、角如何判定?(提出问题后,应给学生自主探索、思考的时间)然后归纳等边三角形的判定方法1:三个角都相等的三角形是等边三角形。
问题4你认为有一个角等60度的等腰三角形是等边三角形吗?你能证明你的结论吗?请把你的证明思路和同伴交流。(提出问题后,再次让学生合作交流,归纳:等腰三角形判定方法2,有一个角是60度,等腰三角形是等边三角形。
3、应用新知巩固提高1。例题解析;课外兴趣小组
(1)由学生们分组相互探讨,共同研究此题的已知、猜想结论部分,然后由小组派代表阐述推理过程,教师板书,在板书的过程中,请其它小组的同学提出合理化建议,使此题证明过程条理更加清晰,从而培养他们语言表达能力。
(2)、课堂练习(然后我又设计了两种不同类型的练习题
第一部分设计了两道有关等边三角形推理的练习。目的是对等边三角形性质和判定进一步理解,并考察学生掌握的情况。
小学二年级数学说课稿篇十二
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小学二年级数学说课稿篇十三
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小学二年级数学说课稿篇十四
用乘法口诀求商是数学计算中的重要内容之一,在整个计算领域中起着举足轻重的作用。本节内容的安排较原有九年义务教育小学数学教科书有很大地改变,主要表现在用乘法口诀求商没有采取分段编排而是集中编排。
同时也没有按照乘法口诀中积的大小来编排,而采取了随机编排,而且例题大大减少,共只有3个例题。这样并不是降低表内除法的口算要求,而是让数学学习内容更切合学生生活实际。集中掌握用乘法口诀求商的策略,可以节约更多的学习时间,学习更多的与解决生活中实际问题和对后续学习更有用的数学知识。
结合教材的编排特点和学情特点,我把本节课的教学目标订为:
1、经历探索用乘法口诀求商的过程,能根据具体的除法算式正确选择乘法口诀求商。能熟练地口算表内除法。
2、经历将实际问题抽象为可运用除法含义解决的简单实际问题的过程。培养数学应用意识,能有条理的思考,提高解决问题的能力。
3、在与他人交流算法的过程中,享受独立思考后发表自己见解的快乐,获得成功的体验,培养学习的主动性,产生对数学的积极情感。
1、教学重点:掌握用乘法口诀求商的方法。
2、教学难点:根据除法算式,很快的找到相应的除法口诀。
1、教法:
根据本课的创设意图,我创设了复习引入自主探究提升训练的教学模式,引导学生从生活中发现问题,思考问题,解决问题。从中体会用数学解决问题思路的灵活性,从而激发学生探究数学知识的欲望。体现学生主体性和主动性。
2、学法:
在学法指导上,我遵从学生发现问题探索总结灵活运用的认知发展规律。充分运用多种思维方式解决同一问题,使学生学会优化方法的选择。
(一)创设情境、导入新课。
1、口算。
2、谈话。
同学们,都喜欢春游吗?在春游的时候,我们都会带好多好吃的和同学们一起分享。下面我们来看看,图上的小朋友们在干什么呀?他们是怎么分的呢?(引导学生说明图意。)
老师板书:有24个苹果:
1、平均放在4个盘里,每盘放几个?
2、每6个装一盘,可以装几盘?
(设计意图:通过对旧知识的复习,激发学生的求知欲望,调动学生学习的积极性,为下一步探究新知打下基础。)
(二)合作学习、探究算法。
1、学习例题1。
师:我们先看第一个问题,谁能说说:24个苹果,平均放在4个盘里,每盘放几个是什么意思?怎样用除法算式表示这种分法呢?
列式:244=
求商:这个算式的商是多少?你能用什么办法求出这个算式的商?
(让学生动手操作用学具摆一摆,求出商。先在小组内交流摆学具求商的过程和结果,然后在全班交流。244=6(个))
师:如果不摆学具,你能用过去学习的乘法口诀直接求出商吗?
师:请同学们想想24除以4,用哪一句乘法口诀能求出它们的商?
生:可以用乘法口诀四六二十四求出244=6
小结:在计算244,先看除数是4,就想4几得24,这样利用乘法口诀很快就能求去商。
师:24个苹果,每6个装一盘,可以装几盘?是什么意思,你能列出算式吗?
根据学生的回答,板书:246=
师:能用哪句口诀求出它的商?
根据学生的回答,教师把算式补充完整。
246=4(盘)
师:请同学们围绕下面两个问题分小组议一议
①上面两道除法算式的商是怎么算出来的?
②从上面的计算中你发现了什么?
学生分组讨论,教师巡视并参与学生的讨论。
引导学生汇报交流讨论的结果。
小结:从上面的两道除法算式的商中,我们发现用一句乘法口诀四六二十四算出来的,这说明一句乘法口诀可以算两道除法算式的商。
(设计意图:通过动手操作、小组讨论让学生全面经历用乘法口诀求商的探究过程,让学生在自主学习中能全神贯注,集中思考)
(三)巩固深化、掌握方法。
完成课堂活动1、2题。
1、议一议:3个算式各表示什么意思?
34=12
124=3
123=4
(让学生根据图说算式的意义,通过说进一步感知乘除法之间的联系)
2、开锁。(连线)
(让学生感受乘法算式和相应的除法算式,乘、除法算式与相应的乘法口诀之间的联系,以此巩固用乘法口诀求商的方法。)
3、用乘法口诀求商。
255=
324=
366=
273=
244=
284=
182=
305=
(强调求商的过程,进一步提高学生应用乘法口诀求商的熟练度)
(四)全课小结。
这节课,我们一起研究了用乘法口诀求商,也就是看除法算式中的除数想乘法口诀。除数和几相乘得被除数商就是几。(采用这种简明扼要的方式结尾,主要是想让学生能在轻松、愉跃的心境下来回顾本节课的知识)
小学二年级数学说课稿篇十五
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小学二年级数学说课稿篇十六
我说课的内容是北师大版义务教育课程标准试验教科书数学第三册第16页《需要几个轮子》。本课是在学生学习了5和2的乘法口诀的基础上进行3的乘法口诀的学习的。教学时,可组织学生借助摆三角形的活动编出3的乘法口诀。学生已经学了5和2的乘法口诀,已经掌握了一些编口诀的诀窍,所以3的口诀可以由学生自己整理。较多的时间应用在熟练口诀和算式上。
1、知识目标:结合“需要几个轮子”的具体情境,经历3的乘法口决的编制过程,会用三的乘法口决进行表内乘法的口算,能够发现乘法口决的排列规律。
2、能力目标:培养学生归纳总结和知识迁移的能力,发展学生自主学习的能力。
3、情感目标:培养学生合作学习意识,体验数学与日常生活的关系。
编制和掌握3的乘法口诀,记忆3的乘法口诀。
教学难点:
理解3的乘法口诀的意义并熟练运用。
小棒、实物展台、多媒体课件、乘法转盘。
小棒,乘法转盘。
教法:本节是3的乘法口诀的编制,学生通过实际的摆一摆、数一数,自己归纳编写乘法口诀的方法。因此,在教学中,将采用启发式教学,直观性教学的教学原则,在教学中采取半扶半放--放的教学方式,充分体现教师为主导,学生为主体的“双主”活动体系。
学情:我班的学生大多来自于农村,很多孩子都没有乘法的基础。因此在教学时,对于这一特点,要多组织学生理解、记忆和运用。
学法:在本课的学习中,通过让学生动手摆小棒,动笔完成表格,动脑编制并且记忆3的乘法口诀的过程,充分的发挥了学生的学习自主性。通过同桌练习乘法口诀对应的乘法算式的过程,培养了学生的合作意识与竞争意识。
我是这样导入的:(出示图片儿童三轮车)同学们,谁小时候骑过儿童三轮车?
1辆三轮车需要3个轮子,
2辆三轮车需要6个轮子,那么3、4、5、6、7、8、9辆三轮车需要几个轮子?(板书:需要几个轮子)
1、填一填
(课件出示表格)
说清楚表格的意思。每个数字代表什么,让我们求什么。用三根小棒来代替三个轮子。三根小棒就组成了三角形。那么有几辆车就要摆几个三角形。接下去,学生拿出准备好的小棒,一边摆三角形,一边完成表格。全班反馈。
2、说一说,写一写
根据表格,一辆车有3个轮子,让学生说是1个3。并且列出两个乘法算式。先让学生说一说编制乘法口诀注意的方面再编制乘法口诀。2辆车需要6个轮子,也就是几个3?学生列2个乘法算式并编制乘法口诀。说一说口诀的意思。接下去,同桌一人说算式,一人编口诀,并把算式和口诀填写在课本16页试一试的第2小题中。
全班反馈。(师板书3的乘法算式和乘法口诀)
3、集体交流并记忆。
先让学生自己读一读3的乘法口诀。说说你是怎样记住3的乘法口诀的?发现什么规律了?同桌交流,全班反馈。提出问题:如果你记住了三五十五,不知道三四多少怎么办?用你喜欢的方式记一记口诀。
4、巩固练习
设计了以下几个小活动
(1)师生对口练
一个“小”字有3笔,一三得三
,两个“小”字有6笔,二三得六。学生接着自己往下编。
(2)乘法转盘
师转动转盘,生说口诀。也可以掺杂2和5的乘法口诀。
(3)同桌练习
一生说口诀,同桌说两个乘法算式。看谁说得好。练习2-3组。
这节课你学会了什么?
生可能会出现的问题:记住口诀而不会计算或者会计算,没记住口诀。教师及时的给以补充和总结。
板书设计:
需要几个轮子(3的乘法口诀)
1×3=3 一三得三
2×3=6 二三得六
3×3=9 三三得九
4×3=12 三四十二
5×3=15 三五十五
6×3=18 三六十八
7×3=21 三七二十一
8×3=24 三八二十四
9×3=27 三九二十七