咨询热线 400-6169-615
2025-07-23 04:46:46|已浏览：10次
无锡学大中小学培训/。无锡补习班，无锡初一培训班，无锡高一辅导班，无锡高考冲刺，无锡中小学辅导励志格言：吃一堑，长一智。无锡学大中小学培训/。
无锡学大中小学培训/想让孩子在学习上大放异彩？无锡补习班，无锡初一培训班，无锡高一辅导班，无锡高考冲刺，无锡中小学辅导励志格言：少一个敌人胜过多十个朋友。无锡学大中小学培训/。
无锡学大中小学培训/。 无锡小学生辅导班，无锡补习班，无锡中小学辅导，无锡提升学习成绩，无锡中小学培训励志格言：成功的企业领导不仅是授权高手，更是控权的高手。——管理专家彼特·史坦普。二年级数学估算技巧教学
一、二年级数学估算技巧教学目标
体会估算意义
让学生了解估算在日常生活中的广泛应用，例如在购物时估算总价、估算时间或距离等，从而增强估算意识，体会到估算在解决一些不需要精确答案的问题时的便利性，提高学生对估算价值的认识。
掌握估算方法
学生要学会多种估算方法，以便能根据不同的问题情境选择合适的估算方法进行快速计算。
二、估算方法教学
近似估算法（四舍五入法）
原理：通过四舍五入等方法，将数字简化到最接近的整数或整十位，便于快速计算。例如在计算加法时，像53 + 29，53相邻的整十数是50（因为3小于5，舍掉），29相邻的整十数是30（因为9大于5，进一位），然后计算50 + 30就能估算出大约的人数了。在减法中同样适用，如72 - 12，72近似为70，12近似为10，70 - 10就可快速得到估算结果。
教学示例：可以给出多个类似的算式让学生练习，如46 + 21，46可近似为50，21近似为20，估算结果为70；82 + 17，82近似为80，17近似为20，估算结果为100等。
规律估算法
原理：利用数学规律和性质，对结果进行估算。例如利用乘法分配律、乘法结合律等规律，可以对复杂乘法进行快速估算。对于二年级学生来说，可以从简单的加法结合律等开始引导，如（23 + 17）+ 12，可以先看23 + 17 = 40，然后再加上12，能快速估算出结果大概是50多。
教学示例：设计一些可以运用规律进行估算的算式，如（11 + 19）+ 21，让学生先发现11 + 19 = 30，再加上21，估算结果为50左右。
联系实际估算法
原理：将数学问题与实际生活情境相结合，利用生活经验进行估算。比如在购物场景中，一个玩具球18元，滑板车37元，18的相邻整十数是20，37的相邻整十数是40，20 + 40 = 60，所以大约是60元。这种方法能帮助学生更好地理解数学在生活中的实际应用，提高他们的学习兴趣和实际应用能力。
教学示例：设置购物、分东西等生活场景的数学问题。如小明去商店买糖果，一包糖果9元，他想买4包，大约需要多少钱？引导学生把9元近似为10元，10×4 = 40元，所以大约需要40元。
三、教学过程
引入估算概念
通过生活实例引入，例如问学生：“如果我们要估算从家到学校大概有多远，你们会怎么做呢？”或者“去商店买东西，没带计算器，怎么快速知道大概要花多少钱呢？”引起学生兴趣，从而引出估算概念。
方法讲解与示范
分别详细讲解上述几种估算方法，边讲边在黑板上进行示范计算。每个方法可以举多个例子，让学生逐步理解。
学生练习
给出不同类型的估算练习题，让学生先独立完成，然后同桌之间互相检查、交流。练习题可以包括加法、减法、简单乘法等不同运算的估算。
反馈与总结
收集学生练习中出现的问题，进行集中反馈讲解。总结估算的重点方法和容易出错的地方，再次强调估算在生活中的应用和意义。无锡补习班，无锡初一培训班，无锡高一辅导班，无锡高考冲刺，无锡中小学辅导励志格言：一定不要把别人都当傻子，事实上，所有你能遇到的人都比你聪明。如果你能抱着这样的心态为人处世，那么你的人脉会越来越宽，财富越来越多，人生也就越来越好！无锡学大中小学培训/。
无锡学大中小学培训/。无锡初中生辅导班，无锡高中生培训，无锡中考培训，无锡高考培训，无锡中小学辅导经典格言：好男人很多，但死心塌地想跟你过日子的男人很少，能遇到的时候别轻易说放弃。。五年级英语阅读理解练习题
一、关于五年级英语阅读理解练习题示例
（一）人物相关情景类
练习题1
文章内容：A train stops at a station(车站). A young man wants to come out， but it is raining. A boy is standing under a big umbrella. The young man says to the boy. Can you go and get us two hambugers， one for you and one for me? Here are two dollars. Great! say the boy and he goes to buy hamburgers. After some time， the boy is back. He is eating a hamburger. Where is my hamburger? asks the young man. Oh， there is only one hamburger left. So I'm eating mine. Here is your dollar.
问题：
Where is the young man? (答案：A At a station)
What does the young man want to buy? (答案：B Hamburgers)
Who helps the young man? (答案：A A boy)
Does the young man get a hambuger? (答案：A No ，he doesn't)
Is the boy clever(聪明的)? (答案：B Yes ，he is)
练习题2
文章内容：There are three people in my family，My father is a worker ，he often plays basketball with me，He hopes me to be YAO MING.My mom is a teacher，she often does housework ，I often help her.I am very happy with my mom and my father.
问题：
What does my father do? (答案：B A worker)
What does my father like playing? (答案：A basketball)
Who does my father hope me to be? (答案：B Yao Ming)
Is my mother a teacher? (答案：B Yes ，she is)
（二）地点与活动类
练习题3
文章内容：Look at that boy. His name is Liu Bing. He's a Chinese boy. He is in the kitchen. He likes apples. Su Yang is at home too. She is in the study. She likes drawing. Is Gao Shan at home? No， he is in the park. He is thirsty. He wants to drink some juice. Miss Li is in the office. She is reading.
问题（判断对错）：
Liu Bing is in the kitchen. (答案：T)
Liu Bing likes eating pears. (答案：F)
Su Yang isn't in the study. (答案：F)
Gao Shan is thirsty and he wants to drink. (答案：T)
Miss Li is drawing. (答案：F)
（三）城市介绍类
练习题4
文章内容：Today I’ll introduce a beautiful city - Guangzhou. Guangzhou is the capital of Guangdong. It is very busy and modern. In Guangzhou， we can go to the Baiyun Hill to watch birds. The birds sing very well. Xiangjiang Zoo is a good place to visit too. We can see many rare animals， such as white tigers， pandas. In the Six Banyan Temple， we can take photos and all of us will have a good time there. Do you like shopping? There are a lot of shopping centers and shopping departments in Guangzhou. The dimsum in Guangzhou is very famous;we can have it at the Guangzhou Restaurant or Banxi Restaurant. Going on the Pearl River Cruise is a good choose at night， because the night views are beautiful.
问题：
The capital of Guangdong is _. (答案：Guangzhou)
We can see a lot of _ at Baiyun Hill. (答案：birds)
There aren't any _ in Xiangjiang Zoo. (答案：未在提供内容中明确提及)
Banxi Restaurant is famous for _. (答案：dimsum)
We can see _ in Guangzhou. (答案：many rare animals, beautiful night views等)
（四）动物相关类
练习题5
文章内容：Lovely Pandas’ faces look like cats’， but their fat bodies and short tails are like bears’. Pandas are very lovely and they are friendly to people. People like them very much. Most Pandas live in China. The northwestern part of Sichuan Province(省) and southern part of Gansu Province are their hometowns. Pandas like to climb trees. They usually live in the forests of high mountains， eat bamboo and drink spring water.
问题：
The panda mainly lives in (). (答案：D.China)
() is like a cat’s. (答案：B.The panda’s face)
Where are the pandas’ hometowns? (答案：C.Gansu and Sichuan)
What’s the panda’s main food? (答案：bamboo)无锡学大中小学培训/无锡补习班，无锡初一培训班，无锡高一辅导班，无锡高考冲刺，无锡中小学辅导励志格言：受思深处宜先退，得意浓时便可休。无锡学大中小学培训/。
