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。范文书写有哪些要求呢?我们怎样才能写好一篇范文呢?下面是小编帮大家整理的优质范文,仅供参考,大家一起来看看吧。
套圈游戏设计思路篇一
本课教学内容从学生已有的生活经验出发,通过学生感兴趣的套圈游戏,引入100以内数的连加计算。教材从第一单元开始,就注重培养学生的估算意识,逐步引导学生建立数感。本课通过有关估算的问题情境的设计,渗透估算意识,体会估算的必要性,并引导学生从多个角度,用不同的方法进行合理的估算。
在探索和掌握两位数连加的计算方法中,进一步体验算法多样化。在解决问题的活动中体验数学与生活的联系,激发学生学习数学的兴趣,树立学好数学的信心。为进一步学习100以内的连减、加减混合运算打好基础。
学生在此之前,已经学习了20以内的连加计算以及100以内的加法运算,具备了解决一些简单实际问题的能力。学生可以借助原有的学习经验来独立探究连加的计算方法。同时,借助课堂中开展的套圈比赛来激发学习兴趣和求知欲。
但是,由于学生存在不可避免的个性差异,教学中,在尊重学生独立思考的基础上,鼓励算法多样化的同时,允许学生选择适合自己的方法解决问题,为学生提供进一步发展的空间。教师通过设计一些探究性和提高性的数学问题,让每个学生在不同程度上有不同的发展。
1、知识与技能:掌握100以内数的连加计算方法,初步发展学生的估算意识和能力。
2、过程与方法:引导学生通过自主探究、合作交流,得出连加的计算方法,进一步体验算法多样化。
3、情感态度与价值观:通过创设情境,激发学生的学习兴趣。让学生感受到数学知识在生活中的广泛应用。
教学准备:套圈游戏的课件 各种标有数字的玩具及圈 统计表
(一)创设情境、引入新知(5分钟)
导言:同学们,你们玩过套圈游戏吗?淘气和笑笑正在进行套圈比赛,我们一起来看看比赛的情况。
(出示课件:淘气和笑笑玩套圈游戏及情况统计表)
第一次
第二次
第三次
淘气
30
23
42
笑笑
28
25
35
师提问:观察套圈过程,你从中知道了什么?
(学生自由发言,说出自己的发现。)
师提出任务:你们估计谁会赢?说一说你的理由。
学生汇报估计的方法:
生1:我估计淘气赢。因为第一次淘气比笑笑得分多,第二次淘气比笑笑得分少,第三次淘气又比笑笑得分多,他两次都比笑笑得分多,所以他赢。
生2:淘气第一次比笑笑多2分,第二次比笑笑少2分,这样,前两次比赛他们就一样多了,关键看最后一次,淘气得分多,所以淘气赢了。
师:谁愿意再说说这种估算方法?
(设计意图:发展学生的估算意识和估算能力。)
(点评:在这一过程中,教师在鼓励学生发表自己意见的同时,能认真去倾听学生的发言,并及时引导学生关注别人发言的精彩和关键之处。)
(二)探究与体验 (15分钟)
师提问:同学们根据数据的特点,运用估算的方法很快就能判断出淘气赢,很好!那除估算外,我们还可以用什么方法来解决问题呢?
生:计算。
师:要计算淘气三次共得多少分,怎样列式解决?
生:30+23+42=
师讲授:像这样的三个或更多的数加在一起的计算,我们称它为连加计算。
提出任务:你们打算怎么算?
生1:30+20+40=90 3+2=5 90+5=95
生2:30+23=53 53+42=95
生3:我把42看成40,30+23+40=93 再加上2等于95。
师:同学们说的方法很不错,想一想:对于三个100以内的数连加,有没有更好的计算方法呢?
生:竖式计算。
(点评:在这一过程中,教师通过问题设计,使学生在口算的过程中,体会到计算的必要性,从而自然过渡到竖式计算。)
师组织合作学习:请同学用自己喜欢的方法,来计算淘气三次共得多少分?可以小组合作,也可以请老师帮忙。
(学生先独立竖式计算,再同桌交流,最后,全班展示不同算法。)
请几名用不同的方法计算的同学黑板前板演。
生1 生2: 30
30 53 23
+ 23 + 42 + 42
53 95 95
生3: 30 生4: 30
+ 23 + 23
53 + 42
+ 42 95
95
(设计意图:对于不同的竖式写法同时展示,由学生先来讲自己的想法,再请大家在比较中找出正确、简便的写法。并且讲解出不同竖式写法的优势。引导学生掌握既简便又合理的计算方法。)
师提问:我们今天新学的竖式计算要注意什么?
生:相同数位对齐,从个位算起。个位满十,向十位进一。
师:请同学们再选择一种适合自己的竖式方法,计算一下笑笑共得多少分?
(学生独立竖式计算再订正。)
师:大家通过准确计算验证了是淘气赢了。今天,我们在套圈游戏中学习了连加计算。
(板书课题:套圈游戏)
(点评:这一过程,使学生进一步体会算式计算与解决问题的密切联系。通过让学生尝试计算的过程,鼓励他们选择适合自己的计算方法,体验算法多样化。并在运用准确计算来检验猜想的过程中,培养了自信心和自我评价的能力。)
(三) 巩固应用 (8分钟)
师提问:小丽也参加了套圈游戏,她只套中了两次,共得了70分,她可能套中了哪两种动物?(课件出示套圈场景图及小丽提出的问题。)
生1:小鸡和小熊猫。
生2:小兔和大象。
师提问:你是怎么判断的?
生答:先看个位相加得10,还得看十位相加得7。
(设计意图:结合70这个数的特点,指导学生用巧妙的方法估计,判断出准确的答案。)
师提问:如果小丽三次套中了100分,她第三次套中了哪个小动物呢?
(学生独立完成书上练一练的第3题。)
出示2000年和2004年的奥运会上我国运动员获奖情况统计表。
师提出任务:请同学估计一下,哪年获得的奖牌多?
(同桌交流估计方法。)
师:请老师左侧的同学用竖式计算2000年的奖牌总数,右侧的同学用竖式计算2004年奖牌总数。
(学生独立计算后,全班交流反馈。)
师:2008年的奥运会将在我国的首都北京举办,相信,在自己的国家,我国的运动员会有更出色的表现。
(四) 实践操作 (10分钟)
准备好需要套的小玩具和圈。按玩具上标的分值大小把其放在相应的位置。
师组织活动:同学们,你们愿意参加套圈比赛吗?咱们一起比比吧!每一小组选一名同学套三次圈,小组其他同学为他计算得分,得分最多而且计算准确的小组为赢。
(学生兴趣盎然的参与其中。)
对于竖式中可能出现的个位满二十向十位进二的题目,师做以适当强调。
(设计意图:通过活动,激发学生学习数学的兴趣,体会到数学学习的乐趣。)
(五) 全课总结 (2分钟)
同学们,今天在套圈游戏中,我们学习了连加计算,看来生活中处处有数学,只要我们用心观察,就会发现,数学就在我们身边。
(设计意图:通过不同的练习,使学生进一步掌握100以内数连加的竖式计算方法,并体会数学在实际中的应用,进一步感受数学思维的灵活性和数学方法的多样性。)
本节课创设了学生感兴趣的游戏情境,充分利用学生以有的知识经验,使学生在有趣的活动中,巩固所学内容。通过实践操作,让学生感受到数学知识在生活中的广泛应用。
套圈游戏设计思路篇二
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套圈游戏设计思路篇三
教材分析:
本节课是在学生已经学习了20以内的连加、连减和100以内的加减法运算的基础上进行的。教材通过学生熟悉的教学情境,从已有的生活经验出发,让学生初步体会估算的必要性,经历数学的再创造,体验计算方法的多样化,在解决实际问题的活动中体验数学、理解数学;强调数学与社会的联系,并让学生掌握100以内的连加运算方法,激发学生学习数学的兴趣,增强学好数学的信心。同时为进一步学习100以内的连减、加减混合运算打下基础。
学生分析:
学生刚学完100以内进位加、退位减运算,并在上学期已经学习了20以内连加、连减及加减混合运算,对于连加并不陌生,用连加解决实际问题也有一定的基础。100以内数的连加要计算出结果对于学生来说并不困难,在前面的学习中学生对算法多样化也有了一定的认识,本节课将继续引导学生探究算法的多样化。
教学目标:
1、在有趣的情境中学习 100 以内数连加运算的(计算)方法,并能正确计算。
2、在与同伴交流算法的过程中,发展初步的估算意识和能力,体验算法多样化。
3、感受数学与生活的密切联系;养成与人合作交流的良好学习习惯;感受数学学习的乐趣。
重点:通过引入连加的实际问题并结合解决问题的过程,探索连加的计算方法。
教学难点:能够结合具体情境进行估算,并能解释估算的过程。
教学流程:
师生谈话:小朋友们,六一儿童节你们过得开心吗?我们的好朋友淘气和笑笑那天进行了一次套圈游戏的小比赛,老师把比赛的情况纪录下来了,你们想看吗?(想)那请小朋友们在看的同时,用你们手中的统计表(课前发给学生)来记录他们的得分,好吗?(板书课题:套圈游戏)
[由于连加的计算过程单调、趣味性不强,而学生年龄小、好动爱玩,因此,变书上的静态图表为课件的动态演示,让学生做小裁判参与游戏之中,以调动起学生的学习热情,集中注意力进入关键环节的学习。]
1、师:观察套圈过程,你从中发现了什么?
2、师:请同学们看看统计表里的数据,你估计笑笑和淘气两个人谁赢了?你是怎样估计的?
(学生交流自己估计的方法时,教师抓住较好的估计方法进行引导。)
[此环节旨在借助学生已有的知识和生活经验,鼓励学生尝试运用估算的方法解决套圈中所需要解决的实际问题,发挥学生学习的主动性。交流中不仅使学生体会可以有不同的估计方法解决问题,初步渗透估计的策略性,同时将初步发展学生的估算意识和能力。]
1、独立思考,探索算法。
(1)师:同学们用不同方法进行了估计,结果都是推测淘气获胜了。怎样才能知道我们估计的对不对呢?
引导学生说出通过比较两人的总分数就可以知道谁输谁赢了,
(2)生提出数学问题,师板书:(1)三次比赛结束时,淘气共得多少分?(2)三次比赛结束时,笑笑共得多少分?
(3)师:这两个问题怎样列式呢?
生列式,师板书:(1)24+29+44= (2)23+30+41=
(4)学生尝试计算算式(1),教师巡视指导。
2、小组交流算法。
师:把你的好方法介绍给小组里的伙伴们,说一说你们的算法有什么不同?
3、学习连加法竖式写法。
(1)小组长汇报组内不同的计算方法,教师板书口算方法及几种不同的竖式方法。(可能出现分两步列,写两个加号画一条横线,写两个加号画两条横线,写一个加号画一条横线等竖式写法。)
(2)引导学生观察比较,总结出连加竖式写法。强调书写方法、注意事项。
4、完成算式(2)的计算。
师:三次比赛结束时,笑笑共得多少分呢?请同学们选择自己喜欢的方法算一算。
全班交流:(1)算式的得数。(2)计算方法。
5、得出结论。
师:通过大家准确的计算验证,我们知道比赛的结果是什么?(淘气赢了)。
【这部分教学活动旨在给学生提供充分展示解决问题策略多样化的平台,使学生进一步体会算式计算与解决问题的密切联系。通过让学生尝试计算的过程,鼓励他们创造自己的计算策略,体验算法多样化,同时教师又在尊重个体的基础上,引导学生掌握公认的基本计算方法,并在逐步调整和运用准确的计算来检验猜想的过程中,发展了运用数学的自信心和自我评价的能力。】
1、我们也来玩套圈游戏怎么样?
课件出示更多的小动物图片,每次在心中圈下3种喜欢的小动物,并算一算得多少分。每人可圈两次。(小动物下的分数包括一位数、两位数,任选三个数加起来均不超过100。)
2、小丽也参加了这个比赛,她前两次共得了70 分。请你猜一猜她可能套中了哪两种小动物?
如果小丽三次套中了100分,她第三次套中了哪个小动物呢?
3、完成书中练一练第3题。
师:套圈游戏其实也算是一项体育活动。你知道2008年在我国北京要举办哪一项世界级的体育活动吗?(奥运会)
师:我们国家的运动员正在进行紧张的训练,争取在奥运会上取得好成绩。让我们先来看一看2000年和2004年我国运动员在奥运会上的获奖牌情况。(课件出示统计表)
(1)先估计一下,哪年获得的奖牌多?(同桌交流估算方法)
(2)请男生计算2000年获奖情况,女生计算2004年获奖情况。(学生独立计算后全班交流反馈。)
(3)提出一个数学问题,并试着解答。
(4)估计一下我们国家在2008奥运会上会得多少块奖牌。
【通过不同层次,不同形式的练习巩固已掌握的100以内数连加的计算方法,并体会数学在实际中的应用,进一步感受数学思维的灵活性和数学方法的多样性。】
1、说一说这节课上你学到了哪些知识?还有哪些收获?
2、今天我们进行了三个数的连加法计算,课后利用今天学到的知识试着算一算四个数、五个数的连加,好吗?
反思:
本课教学内容从学生已有的生活经验出发,通过学生喜闻乐见的套圈游戏引入100以内数的连加计算。通过有关估计的问题情境的设计渗透估算意识,体会估算的必要性。在探索和掌握两位数连加的计算方法中,进一步体验算法多样化,在解决问题的活动中体验数学与生活的联系,激发学生学习数学的兴趣,树立学好数学的信心,为进一步学习100以内的连减、加减混合运算打好基础。
对于连加计算方法的探究,学生在学习100以内数的加法中早已接触。无论是从计算形式上还是具体的计算方法上学生都可借助旧有学习经验来独立探究连加的计算方法,同时学生在生活中也积累了如购物算价钱、套圈比赛的生活经验,这些都会激发学习兴趣和求知欲,有助于本节课对计算方法的探究学习。
但我们不能忽略的是由于每个学生的生活经验和知识背景的不同,思考问题的角度也不相同。教学中在尊重学生独立思考的基础上,鼓励算法多样化的同时不能要求全体学生都对方法一一掌握,要允许学生选择适合自己的方法解决问题。当学生选择不同方法计算时又会出现计算错误的现象,同时还有的学生为了追求与众不同而想出无本质区别的方法。这时教师就要引导学生分清方法的优劣,指导学生如何选择有价值的解决问题的方法。课堂中也要为学生提供一个进一步发展的空间,教师通过设计一些提高性和开放性的数学问题,让更多的学生在不同程度上有不同的发展。
一年级的学生年龄比较小,以具体形象思维为主,所以在教学时,首先以生动形象的情境吸引学生,激发求知的欲望,调动学习的积极性,促使学生自主学习。本节课的一个重要目标就是初步培养学生的估算意识,因此,通过问题情境谁会赢使学生体会到估算的必要性,为学生的.思考留下充分的空间,积极引导学生独立思考出几种不同的估算方法。在新知探索中,我又通过不同的形式营造一种研究、合作、交流的学习氛围,鼓励算法多样化,并能尊重学生的自主选择,充分体现学生的主体性,在学习的过程中使学生学会思考问题的方法,培养他们的自信心和创新思维,同时也使其掌握100以内的连加运算的方法。
这节课还有许多不足之处,在小组活动时,还是没有完全让每个学生释放出自己的潜能,如何培养学生的合作学习方式还有待于在今后的教学过程中不断尝试与改进。
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1、探索并掌握100以内数连加的计算方法,进一步体验算法多样化。
2、发展初步的估算意识和能力。
一、看清题意,引题
看图,利用书上的问题引导学生开展估算活动,体会估算的必要性。
1、独立思考。
2、组织学生交流估算的方法。
3、然后通过计算进行验证。
二、解决问题。
教师进一步引导学生自己来解决“三次比赛结束时,笑笑共得多少分”,并用自己喜欢的方法进行计算。
教师鼓励学生探索自己的方法,鼓励算法多样化。
三、想一想。
这是一个开放性问题,教师要引导学生进行有条理的思考,如“如第一次如果是23分,第二次是多少分”。并注意培养学生估算意识。教学时,教师也可以鼓励学生提出其他的问题,并进一步进行讨论。
四、练一练。
教学时,先让学生进行估计,培养学生的估算意识,然后独立完成。
套圈游戏设计思路篇七
学生刚刚学完100以内的进位加、退位减的运算,再学习100以内数的连加,对大多数学生来说应该不算困难。但本课时出现了用表格来呈现信息的形式,对于一年级的学生来说,读取表格信息有一定的挑战性,所以在教学时需要适时地加以引导。数学中的算法多样化、估算意识的培养在这节课中也要让学生经历和体验。
1.探索并掌握100以内数连加的计算方法,进一步体验算法多样化。
2.发展初步的估算意识初步体会估算的必要性
3、在提出问题、解决问题的过程中发展学生的合作交流能力。
教学重点:在计算的过程中体会算法多样化,培养估算意识。
教学难点:经历估算和计算的过程,了解估算的方法体验计算方法的多样化。
一、创设情境,经历估算
1、假期里我们的好朋友淘气和笑笑进行了一次套圈比赛,游戏的规则是每人只能套三次,每次套不同的动物。让我们做他俩的啦啦队,猜一猜谁会赢。 (教师出示课件,将笑笑和淘气玩套圈游戏的画面呈现在学生面前。)
学生看完画面后教师接着出示情况统计表。这是淘气和笑笑每一次的分数。你能读懂吗?
学生自由发言,分别说出自己看懂的信息。
【设计意图:利用课件呈现套圈游戏情境图,让学生经历从熟悉情境到读懂统计表的过程,而让学生猜测“谁会赢”使学生产生极大的兴趣。】
2、同学们知道了他们每一次的分数,那你们能根据这些数据估计淘气和笑笑谁会赢吗?说出你的理由。
学生可能出现的估计方法有:
1、根据他们各自的得分估计:笑笑有两次分数都比淘气多,所以是笑笑赢了。
2、按照淘气和笑笑赢的次数来估计。笑笑赢了两次,可淘气只赢了一次。
3、可以根据每一次两人的得分做比较,第一次笑笑落后淘气一分,第二次淘气落后笑笑一分,这样他俩就平了,可第三次是笑笑多,所以是笑笑赢。
4、不会估计可能在计算(用算吗?为什么)
[设计意图:借助学生已有的知识和生活经验,鼓励学生尝试运用估算的方法解决实际问题,渗透估算的策略性,同时培养学生的认真倾听能力。]
二、验证猜测,探索算法
1、计算淘气的成绩。
(1)除了估算,我们还可以用什么方法才能得到准确的答案呢?
预设:可以先将笑笑三次比赛的分数加在一起,算算共得多少分;再算淘气三次得的分数,就知道谁赢了。
谁能帮助笑笑和淘气列算式呢?
淘气24+29+44= 笑笑23+30+41=
(2)教师引导学生观察这两个算式有什么特点。(有三个数相加、有两个加号) 揭示课题——连加的计算。
(3)鼓励学生独立尝试解决24+29+44=。(每个学生一张作业纸写上方法一:方法二:方法三:)试一试你能用几种方法计算连加。
预设:
方法一:20+20+40=80,4+9+4=17,80+17=97。
方法二:24+29=53,53+44=97。
方法三:24+44=68,68+29=97。
方法四:还有的学生可能会用竖式方法来计算。(肯定这些学生的做法,并作出针对性评价。)
(4)同时教师向学生介绍:准确计算时,竖式也是我们经常用的方法。你们现在愿意用竖式来尝试一下吗?
学生先独立用竖式计算,再同桌交流。教师巡视指导,最后全班投影展示不同的算法。
预设学生可能出现的方法:
比较三种方法,你喜欢哪种方法为什么?
[设计意图:对不同的竖式写法同时展示,让学生先来讲自己的做法,比较各种写法的优势,找出正确、简便的写法,以引导学生掌握简便、合理的计算方法。] 教师引导:竖式计算时,你认为有没有需要提醒大家注意的地方呢?(竖式计算时,相同数位要对齐,从个位算起,个位满十向十位进一。)
教师强调:无论用哪种方法进行计算,都要注意相同数位要对齐,哪位满十哪位向前一位进一。
(5)为什么很多同学都喜欢用竖式计算呢?他有什么特点呢?
竖式记录简便,容易计算。
2.计算笑笑的成绩。
你愿意用你喜欢的方法来帮助笑笑算一算共得多少分吗?
学生独立计算再集体订正。
教师引导学生比较淘气和笑笑谁赢了。
预设学生可能的回答:因为97>94,所以我认为是淘气赢了。
教师小结:大家刚才通过准确计算验证了是淘气赢了。
[设计意图:此环节让学生通过尝试计算的过程,体验算法多样化,并使学生在运用准确计算来检验猜想的过程中,培养自信心和自我评价的能力。]
三、巩固新知,拓展思维
1.小丽看到淘气、笑笑和我们玩得这么开心,她也来参加了,她前两次共得了70分,她可能套中了哪两种动物?
①学生独立思考,并算一算。
②学生汇报结果:小鹿和小象,23+47=70;企鹅和白鹅,29+41=70。
③检验算得对吗?先看个位相加,末位是不是0,还得看十位相加是不是得7。
2.小丽三次套了不同的动物,最少可得多少分?最多呢?(能力强的同学可做第二个问题)
学生先口答最少(最多)分要套到什么动物,然后用喜欢的竖式方法笔算,完成后集体订正。
设计意图:这道题对学生来说,不单纯就是一道简单的计算题,这里学生要想进行计算,必须先要考虑什么动物的分最少,什么动物的分最多,然后才能计算,从而培养学生收集、筛选数学信息的能力。
四、实践应用,深化体验
全班同学玩套圈游戏。
我们也来玩一次套圈游戏怎么样?(学生打开教材第76页)规则:在书中圈下你喜欢的小动物并算一算你得多少分。(选择的动物只数不限)
[设计意图:让学生通过不同形式的练习巩固新知识,体会数学与生活的密切关系。]
五、总结
同学们,今天这节课你学习了什么?你有什么收获?
套圈游戏设计思路篇八
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