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1、名师精编优秀教案两位数乘两位数（估算乘法）主备教师设计使用教师修改教学目标：1.使学生能结合具体情境,在积极参与和讨论合作学习的过程中进行乘法的估算，会说明估算的思路。2.能运用所学知识解决日常生活中简单的实际问题。3.给学生创设主动探索估算知识的空间，培养估算意识，提高估算能力。重、难点：探索乘法估算的方法，学会乘法估算。教学准备：挂图、幻灯。创 设 的 主要 问 题 情景：同学们在电影院里看过电影，那么你们知道电影院里有多少排椅子？每排有多少个座位呢？出示 P59例 2情境图引导学生观察：情境图中提供了有关电影院里里的哪些信息？小明同学提出了什么问题？合 作 探 究的 核 心 问题 及 教
2、 师点拨、升华点：350 名同学来听课，能坐得下吗？”你能根据图中提供的信息解决这个问题吗？试试看。要判断 350 名学生能否坐得下，必须估算出电影院里大约有多少个座位。名师精编优秀教案教学过程：一、创设情境，引入新课：1.同学们在电影院里看过电影，那么你们知道电影院里有多少排椅子？每排有多少个座位呢？哪个同学知道？愿意来说一说吗？2.出示 P59例 2 情境图。引导学生观察：情境图中提供了有关电影院里里的哪些信息？小明同学提出了什么问题？二、自主探究交流提高1.教学例 2。“350 名同学来听课，能坐得下吗？”你能根据图中提供的信息解决这个问题吗？试试看。（1）小组合作交流你用什么方法估算？
3、（2）指名汇报。师小结整理如下：要判断 350 名学生能否坐得下，必须估算出多媒体教室大约有多少个座位。方法一：1820 2220 2020=400（个）所以，350名学生能坐下。方法二：1820 2220=440（个）所以，350名学生能坐下。方法一：2220 1820=360（个）所以，350名学生能坐下。（3）小结：同学们太棒了，能根据已学的估算知识，想出了这么多的好方法，可见，估算在我们日常生活中的作用太大了，那么，谁能告诉老师，你是怎么估算的呢？同时出示课题两位数乘两位数乘法的估算（4）小组合作交流后，引导学生总结出估算的方法：估算时，先把两位数看成最接近它的整十数，然文档编码:CR
4、2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P
5、1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX
6、6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U
7、8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK
8、6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9
9、C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文
10、档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10名师精编优秀教案后再进行计算。四、巩固深化、拓展应用1.第 59 页做一做。看清题意，独立完成选择自己喜欢的方法算。说一说你是怎么估算的。2.第 61 页第 7 题。引导学生观察图，
11、说说你从图中得到什么信息？人人动手独立完成，将估算结果写在小黑板上。同桌交流，说说估算的方法。投影展示学生的试题，说说你的估算方法，集体讲评。3.第 61 页第 8 题：（1）小组合作学习，理解题意。说说从“学生们已经种了93 棵树苗”中，你可得到什么信息？（2）人人动口在小组交流估算方法。文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2
12、 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W1
13、0Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X
14、10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码
15、:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4
16、U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3
17、 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1
18、V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10名师精编优秀教案（3）请个别同学全班交流。4.第 62 页第 9 题，夺红旗小游戏。以小组为单位，按箭号所指的方向开始计时。请优胜组派代表介绍经验。给优胜小组插上小红旗。五、总结回顾评价反思这节课，你又有什么收获？文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:
19、CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U
20、7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3
21、HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V
22、1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2
23、ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10
24、Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10文档编码:CR2X4U7P1Y3 HX6W1V1U8I2 ZK6W10Y9C1X10