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部分教案展示


3.2 三位数乘一位数(进位)

教学内容: 青岛版教材P26,三位数乘一位数(进位)。

教学提示:整节课应以学生的自主学习探讨为主,教师适当引导,同时教师充分鼓励和尊重学生的多样性独立思维方式。

教学目标:

1. 知识与能力:

1)学习三位数乘一位数进位乘法的竖式计算,

2)理解算理并能运用简便写法熟练计算。

2. 过程与方法:

加强学生的估算意识,能够运用所学知识解决简单的实际问题,能对问题做出正确分析,对同一类题目做出总结和概括,提高解决问题的能力。在操作学习过程中,培养学生合作意识,口头语言表达能力。

3. 情感态度价值观:

通过学习感受大海的富饶,热爱大海,增强保护大海的意识。

 

重点、难点:

教学重点:

1. 学习三位数乘一位数进位乘法的竖式计算,

2.理解算理并能运用简便写法熟练计算。

教学难点:

加强学生的估算意识,能够运用所学知识解决简单的实际问题,能对问题做出正确分析,对同一类题目做出总结和概括,提高解决问题的能力。

教学准备

教师准备:课件

学生准备:练习本

教学过程

(一)新课导入:

师:同学们,上节课我们随着赶海队伍的归来,大家回忆一下上节课,学习了哪些内容?在竖式计算时应注意哪些问题呢?

1:相同的数位对齐。

2:从个位乘起,与哪一位相乘,乘得的积就写在那一位的下面。

师:上一节课他们赶海队伍从海里捕到了许多海产品,他们把这些海产品怎样了呢?我们一起去看一看吧!   

板书课题:三位数乘一位数(进位)

设计意图:本环节让学生回忆竖式计算三位数乘一位数的计算过程,整理、交流思路,为学习竖式计算做知识准备和方法准备。 

(二)探究新知

1.出示信息窗2,理解情景图。 

1)提出问题。

出示情景图:图中呈现的是渔民在海水养殖场的劳作场面。 

2)请学生提出自己想知道的信息。 

3)从学生获得的信息中,选择并提出问题。 

例如:渔民用蟹笼养螃蟹一笼养8只螃蟹共121笼。一共养螃蟹多少只? 

渔民叔叔用7个笼子养扇贝,每笼装125只扇贝,7只笼子能装多少只扇贝? 

2. 探讨计口算方法。

学习第一个红点知识。两位数乘一位数一次进位的笔算乘法 

1)请学生思考,交流解决问题的方法,列出算式:121×8 

2)尝试用竖式计算,理解算理。 

3)尝试讨论,掌握算法。                    

 1 2 1                   

×   8

     

引导学生比较:复习题中板演的与例题,有什么相同点?有什么不同点?怎样处理进位的数?使学生明白乘数乘被乘数个位上的数积满十,向十位进1;如果积满二十,应向十位进2,积满三十呢?------ 

①归纳:用一位数乘被乘数个位上的数,积满几十,就向十位进几,乘十位数,满几十向百位进几,即向前一位进几。 

②注意:告诉学生,为了防止忘记,进位数可写小一些记在横线上。 

3. 教学第二个红点知识三位数乘一位数连续进位的笔算乘法。   

出示信息窗2,根据第二幅图讲出数学故事:渔民叔叔用5个笼子养扇贝,每笼装125只扇贝3只笼子能装多少只扇贝? 

1)列出算式。125×7 

2)请一名学生在黑板上写出竖式。学生尝试计算。 

3)合作交流,谈算法。 

4)小结:引导学生归纳乘数是一位数的乘法计算方法,说明乘的顺序及进位法则。用竖式计算时,注意什么?

设计意图:充分利用主题图,引导学生认真看图,在图中寻找数学信息,培养学生分析图的能力,解决问题的过程由独立解答到小组学习,使学生体会到合作学习的重要性。  

 (三)巩固新知:

1.尝试练习,及时指导。         

242×3          152×4 

2.完成课本第27页4题 

独立完成,集体订正。重点指导进位问题。

设计意图:学习计算的目的是为解决实际问题服务的,学生运用学习的新知识解决问题,巩固方法,熟练计算。

(四)达标反馈

一、竖式计算。

127×2=            365×4=             246×4= 

 

 

二、数学门诊。

1、一位数乘三位数,积只能是三位数。            (  )

2、一个因数是48,另一个因数是6,积是248。         (  )

35241相加可以写成241×5。              (  )

4316×6的积比217×7的积小。               (  )

三、体验数学。

1、水果店运进一批水果,运进苹果128千克,梨的重量是苹果的4倍。运进梨多少千克?

 

 

 

2.每千克荔枝进价6元钱,超市进货231千克,一共花了多少钱?

 

 

 

3.手套厂的阿姨昨天上午织了322双手套,下午织了248双,今天比昨天多织了8双,今天织了多少双手套?

 

 

4.工人叔叔在路的两旁栽花,每边栽285棵,一共栽花多少棵?

 

 

 

 

答案:

一、254  1460  984

二、××√×

三、1128×4=512(千克)

2231×6=1386(元)

3、(322+248+3=573(双)

4285×2=570(棵)

   五)课堂小结

师:通过这节课的学习,你有收获吗?能不能把你的收获说给大家听? 

生:我学会了算三位数乘一位数的方法。 

 设计意图:让学生自己谈收获,在头脑中建构清晰地知识结构,增强学生在学习上的自我反思能力。

(六)布置作业

一、填一填

1342×3的积是( )位数,342×2的积是( )位数。

2、三位数乘不为0的一位数,积可能是( )位数,也可能是( )位数。

二、竖式计算。

118×2=                 283×4=

 

 

 

三、列式计算。

15 173 是多少?

 

 

24 253 是多少?

 

 

3232 4倍是多少?

 

 

 

四、解决问题。

1、小红每天上学要骑 7 分钟自行车,她平均每分钟骑 185 米。小红家和学校相距多少米?

 

 

 

2、学校运动会开幕式,有 4 个方阵,每个方阵 128 人,一共有多少人?

 

 

 

 

3、一列火车有 9 节车厢,每节车厢有 118 个座位,这列火车一共有多少个座位?

 

 

 

 

 4630个同学乘 火车去旅游,共坐4节车箱。前 3 节各坐 178 个同学,第 4 辆汽车 要做多少个同学?

 

 

 

 

答案:

一、1、四   2、三、四

二、236  1132

三、15×173=865

2253×4=1012

3232×4=928

四、1185×7=1295(米)

2128×4=512(人)

3118×9=1062(个)

4590178×3=590534=56(人)

 

板书设计

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    5
  • 服务态度

    Warning: Use of undefined constant pf3 - assumed 'pf3' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 403
    5
  • 综合评分

    Warning: Use of undefined constant pf1 - assumed 'pf1' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 404

    Warning: Use of undefined constant pf2 - assumed 'pf2' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 404

    Warning: Use of undefined constant pf3 - assumed 'pf3' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 404
    5
  • 写评价赚积分

Warning: Use of undefined constant bh - assumed 'bh' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 409
  • 交易规则

Warning: Use of undefined constant ty1id - assumed 'ty1id' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 481

Warning: Use of undefined constant jygz - assumed 'jygz' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 481

Warning: Use of undefined constant txt - assumed 'txt' (this will throw an Error in a future version of PHP) in /home/wwwroot/zhaizhaolei123/wwwroot/product/default/viewmb.php on line 483


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      本平台采用的是类似淘宝的担保交易形式,整个交易过程由平台进行担保,买家付款后钱款进入平台账户,买家收到宝贝确认无误后,平台打款到商家账户,确保整个交易流程公正。


资料默认是以百度网盘链接的形式自动发送,付款后立马即可收到,无需等待。


退款情形:

 

一、实际资料与宝贝详情描述不符的:

(1)版本信息不符,如:宝贝描述显示是人教版,结果收到的链接是其他版本的;

(2)资料与现行教材不配套的,如:宝贝详情里标明为最新资料,实际为旧版资料的;

(3)收到的资料宝贝详情所列资料不同,挂羊头卖狗肉的;

(4)宝贝详情里标明有的资料实际没有或者资料缺失不完整的;

(5)资料整理乱、差、重复、缺失的;

注:个别版本的资料及其稀缺,暂时无法保证完整的,需在宝贝详情里标明,否则责任归咎于商家。


二、商家拒绝履行售后服务的:

(1)收到资料无法打开,或打开为乱码的,商家不协助解决的;

(2)资料中个别文档无法正常使用,商家不予替换或修复的;

(3)资料在下载过程中出现问题,商家拒绝指导的;

      (4)商家未履行相关承诺的;

注:有时咨询就多,为节约您的时间,常见问题可以自行解决:资料打不开?95%都是因为:①您没有安装解压软件,点此下载安装解压软件;②您没有安装办公软件,点此下载办公软件;③swf格式的文件打不开,点此下载qq影音;④PDF格式文档打不开,点此下载PDF阅读器。这些都是常用办公必备软件哦!


注:满足以上情形者均无条件退款!


1、在未拍下前,双方在QQ上所商定的内容,亦可成为纠纷评判依据(商定与描述冲突时,商定为准);

2、在没有"无任何正当退款依据"的前提下,写有"一旦售出,概不支持退款"等类似的声明,视为无效声明;

3、虽然交易产生纠纷的几率很小,但请尽量保留如聊天记录这样的重要信息,以防产生纠纷时便于网站工作人员介入快速处理。


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