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市级一等奖小学数学教学设计 | 人教版四年级下册《平均数》

市级一等奖小学数学教学设计 | 人教版四年级下册《平均数》

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教学内容

教科书第8788页例1、例2及相关内容

教材分析

《平均数》选自人教版小学数学四年级下册第八单元,属于统计与概率领域中平均数与条形统计图的起始内容,本课在学生掌握平均分、除法运算的基础上展开教学,是学生从具象的平均分走向抽象统计概念的关键节点。教材以学生熟悉的生活情境为载体,以象形统计图呈现数据,通过移多补少先合后分两种方法,引导学生理解平均数的意义,掌握求平均数的基本方法,为后续复式条形统计图等统计知识的学习奠定基础,同时培养学生的数据意识。

学情分析

四年级学生已经掌握了基础的整数四则运算,也有平均分物品”“算平均分等生活经验,对平均一词并不陌生,能理解把总数分成几份的基本思路。但学生对平均数的统计意义理解较为模糊,容易混淆平均数平均分的概念,难以理解平均数的虚拟性(即平均数不一定是原始数据中的某个数),也很难体会到平均数代表一组数据平均水平的价值。教学中需要借助直观操作、对比情境,帮助他们从具象的平均分,过渡到抽象的统计概念理解。

教学目标

1.在具体情境中感受平均数的应用价值与产生的必要性,通过操作体会平均数的意义,能计算简单数据的平均数。

2.经历用平均数解决生活问题的过程,积累数据处理方法,感知移多补少思想,发展统计观念。

3.乐于与同伴交流合作,体验运用知识解决问题的乐趣,增强学习数学的信心。

教学重点

理解平均数的意义,掌握求平均数的方法。

教学难点

理解平均数的意义。

教学过程

一、创设情境,引入新课

(一)联系生活,情境激趣

教师播放课前导入的视频,引导学生观察环保小队收集矿泉水瓶的情况。

(二)获取信息,提出问题

1.课件出示教科书P871的主题图。

教师提问:请大家仔细观察,你知道了哪些数学信息?

2.引导学生观察、比较图中的数据,厘清横轴和纵轴分别表示什么,每个人收集的数量是多少,谁最多,谁最少,请学生汇报。

预设1:横轴表示数量,纵轴表示姓名。

预设2:学生可能会说出每人收集的个数,也可能会说出小明收集得最多,小亮收集得最少。

3.出示问题:这个小队平均每人收集了多少个矿泉水瓶?

【设计意图】创设收集矿泉水瓶的生活情境,贴近学生生活,激发学习兴趣。引导学生观察图表、提取数据、比较数量,培养观察分析能力。顺势提出平均数相关问题,自然引入新知,为后续学习做好铺垫。

二、经历过程,探究新知

(一)探究交流,认识平均数

1.独立思考,探究方法

独立思考,尝试用画一画、移一移、算一算来解决问题。

与同桌交流想法,将计算步骤或思路写下来。

2.小组汇报,交流算法

1移多补少求平均数。

小组展示作品,教师指明学生上台操作并说明过程。

预设:学生可能会边操作边说小红给小兰1个,小明给小亮2个,这时候他们4人的空水瓶的数量就一样多了,都是13

提问:在移动的过程中,什么变了?什么没变?

预设:总人数和瓶子的总数量没变,每个人收集到的瓶子变得同样多了。

引导小结:把多的给了少的,使得每个人收集的空水瓶数量同样多。我们把这样的方法叫作移多补少

课件演示移多补少的动态过程。(板书:移多补少

13就是他们收集的矿泉水瓶数量的平均数。(板书课题:平均数)

2先合后分求平均数。

预设1:要使每人收集的空水瓶数量同样多,可以先将该小队收集的空水瓶的总数量求出来,再平均分成4份,看1份是多少。

预设2:算式可以这样列:

(14+12+11+15)÷4

=52÷4

=13

教师根据学生的回答板书。

先把4人收集的空水瓶的总数量求出来,是52个。4是总份数,除以4表示平均分成4份,13就是每个人收集空水瓶数量的平均数。这种方法叫作先合后分。(板书:先合后分:总数量÷总份数=平均数)

引导小结:我们用移多补少的方法和先合后分的方法都得到了这4个数的平均数是13

【设计意图】本环节通过小组合作探究,让学生动手操作、自主思考。借助移多补少直观感知平均数,再推导先合后分计算法,由直观到抽象,体会策略多样,深刻理解平均数意义与计算本质。

3.对比发现,揭示课题

学生自主思考,这两种方法有什么相同的地方呢?

...

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  1. CONNECT:[ UseTime:0.000913s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001423s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000707s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000630s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001337s ]
  6. SELECT * FROM `set` [ RunTime:0.000551s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001578s ]
  8. SELECT * FROM `article` WHERE `id` = 968897 LIMIT 1 [ RunTime:0.012557s ]
  9. UPDATE `article` SET `lasttime` = 1787713084 WHERE `id` = 968897 [ RunTime:0.052873s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.010087s ]
  11. SELECT * FROM `article` WHERE `id` < 968897 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.028081s ]
  12. SELECT * FROM `article` WHERE `id` > 968897 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011636s ]
  13. SELECT * FROM `article` WHERE `id` < 968897 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004312s ]
  14. SELECT * FROM `article` WHERE `id` < 968897 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005320s ]
  15. SELECT * FROM `article` WHERE `id` < 968897 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010576s ]
0.322782s