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五四制说明.JPG

试用链接:

https://pan.baidu.com/s/11rQK7mArWBMdlaTehuKEXQ 

提取码:1234



五四制目录.JPG五四制目录2.JPG五四制课件展示1.jpg五四制青岛版课件演示2.png

部分教案展示


4的乘法口诀(信息窗3)》参考教案

教学目标

1.经历由加法推导乘法算式的过程,进一步体会乘法的意义,了解乘法口诀的产生。

2.通过实践熟悉、掌握4的乘法口诀。

教学重难点、关键

重点:通过实践熟悉、掌握4的乘法口诀。

难点: 经历由加法推导乘法算式的过程,进一步体会乘法的意义,了解乘法口诀的产生。

关键:4的乘法口诀的综合运用。

教学具准备

课本、电脑,实物投影仪。

教学过程

一、创设情境、提出问题

教师:艺术节的表演越来越精彩了。小丑头顶小碗,手扔彩球,每个小丑头顶多少个小碗?手里有几个小球?

有一位小朋友又编了一个顺口溜,一个小丑3个球,4个小碗顶在头;两个小丑6个球,8个小碗顶在头;你能接着说下去吗?

学生举手说一说。

师生共同回顾3的乘法口决,学生举手说一说。

二、自主学习,小组探究

1.摆一摆。

用你手里的小长条来表示小丑的数量,用小圆片表示出一个小丑头上的碗的数量。摆一摆,看看有什么发现。

学生摆,教师巡视。

根据你刚才摆的,你能来说说一个小丑头上顶着几个碗吗?

引导学生按照顺口溜的方式说一说

2.探究两个小丑手里有几个球。

1)在你刚才摆好学具的旁边,用同样的方式再表示一个小丑和他头上的碗。

2)现在你摆了几个小丑了?

3)两个小丑头上有几个碗了?

教师:你是怎么知道的?学生回答时老师板书加法算式。

两个小丑头上的碗       4+4=8

3.探究3个小丑头上的碗的数量。

学生独立完成,教师巡视。

指生答,并说说自己思考的过程。

4.用同样的方法完成书上其他部分。

学生操作,教师巡视。

让学生在摆的同时理解相同加数连加的过程,为引导学生列出乘法算式做准备。

5.指生答:你是怎样完成的?

指生板演。

三、汇报交流、评价质疑

这些加法算式我们可以用乘法来表示。

1.一个小丑头上有4个碗,就是1个4,那么可以用乘法算式1×4=4来表示。

指生说各部分的含义。

为了便于记忆,我们给他编了一个乘法口诀,就是一四得四。

2.你能用乘法算式表示2个小丑头上的碗的数量吗?

指生答     2×4=8

那么我们也可以给它编一个乘法口诀,就是二四_____

让个别学生到黑板上板演其他由几个算式编出的口诀。

全班齐读算式和口诀。

教师指名让学生回答。

教师引导学生找到规律,发现其中的特点,从而进一步掌握乘法口诀。

四、抽象概括、总结提升

同学们,这节课你知道了什么?你觉得自己的表现怎么样?

学生先举手说一说。

教师总结:今天我们主要学习了4的乘法口诀:一四得四、二四得八、三四十二、四四十六和四五二十。今后遇到与4相乘的知识,我们就可以用上面的乘法口诀来解决问题了。

五、巩固应用、拓展提高

1.你能把学过的口诀说个你的同位听一听吗?同位之间互相看口诀,说算式。

2.学生独立完成课本11页主练习第3题。

对于有困难的同学,教师个别指导,几名同学举手说出答案,师生共同纠正。

3.学生自己完成课本11页自主练习第4题。

教师先引导学生读信息图,最后1名同学读出答案。

作业布置

1.自主练习第5题。

2.熟记4的乘法口诀。

板书设计

4的乘法口诀

1个小丑4个碗   4   1×4=4   口诀:一四得四

2个小丑8个碗   4+4=8  2×4=8  口诀:二四得八

3个小丑12个碗   4+4+4=12   3×4=12  口诀:三四十二

4个小丑16个碗  4+4+4+4=16   4×4=16   口诀:四四十六

5个小丑20个碗  4+4+4+4+4=20   4×5=20   口诀:四五二十


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(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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