十几减8教学设计
- 格式:docx
- 大小:38.61 KB
- 文档页数:7
十几减8教学设计
教学内容:本节课将教授新人教版小学数学一年级上册第二单元第13页例2《十几减8》,并完成13页的做一做和15页的练三的第一题练。
教学目标:本节课的目标有三个:1)使学生理解十几减8的算理,能够正确地进行口算;2)让学生在自主探讨、小组合作探究十几减8的算理的过程中,体验计算方法的多样性,引导学生比较和优化方法;3)在培养学生观察问题、解决问题的时候研究数学,让学生感悟生活中处处有数学。
教学重点:本节课的重点是理解“十几减8”的算理,能正确计算“十几减8”。
教学难点:本节课的难点是对“十几减8”退位减法的口算方法的理解。
教学准备:本节课需要准备圆片、小棒、多媒体课件。
教学过程:
一、游戏引入,唤醒旧知:
老师:同学们,昨天我们在游乐园玩得很开心,今天我们继续在游乐场畅游一天。我们来玩一个游戏,开火车依次出现题目,孩子们回答:8+4=、6+8=、8+8=、8+7=、8+( )=13、15-9=(孩子们回答完毕)
老师:孩子们真厉害,那么快把这些算式算出来了。你们有什么好的方法计算15-9=6呢?(学生回答,老师引导学生比较和优化方法)
二、研究新知,自主探究
老师:孩子们真棒,能够把我们研究到的知识运用到我们的生活中。然而我们研究是无止境的,生活中处处有数学。今天熊猫带着风车来到了我们班级,实际操作摆了12个风车,拿走了8个,直观看到还剩4个。(出示例2主题图)
1、收集信息,回答问题 老师:在图中你都知道了什么?能和我们说说吗?(学生回答,熊猫宝宝一共有12个风车,小男孩说我们要买8个)
老师:要求的问题是什么?(还剩几个?)
老师:你能完整地说说这幅图的意思吗?(一共有12个风车,小朋友们买了8个,还剩几个?)
老师:孩子们真棒,能够在图中发现我们的数学问题。然而呀,熊猫宝宝不知道它还剩多少个风车?你们能帮助它吗?(学生回答,还剩4个)
老师:要求“还剩几个”,你能用算式解答吗?(学生回答,12-8=4)
设计意图】这一环节让学生自己发现问题,逐步提问让学生更能了解题目的已知条件,以便培养学生的口头表达能力和观察能力。同时,让学生自主探究、比较算理并优化。
三、引导学生总结归纳
老师:通过这个例子,我们研究到了十几减8的算法。你们能不能总结一下呢?(学生回答,老师引导学生总结归纳)
四、巩固练
老师:现在,我们来完成13页的做一做和15页的练三的第一题练。(学生完成练)
五、课堂小结
老师:今天我们研究了十几减8的算法,通过自主探究和比较算理,你们掌握了这个算法。在今后的研究中,希望大家能够继续努力,认真研究数学知识,感悟生活中处处有数学。
XXX: How did you all solve the n 12-8=4.Can you teach it to
Panda Baby。Please discuss with your desk mate and use XXX.)
1) Have the students report their ideas to the whole class and
the teacher can guide them with the help of the courseware。
Student 1: We did it like this - we wanted to make 8+4=12.so
we subtracted 8 from 12 to get 4.
Student 2: I took 8 out of 12 windmills。so there were 4 left.
Student 3: I first divided the 12 windmills into 10 and 2.then
took 2 from the 10.and 2+2 is 4.
Perhaps there are students who say 12-2-6=4.
XXX: Well done。everyone。XXX Baby so many methods
at once。This is one of the mysteries of mathematics。The
advantages of breaking ten。continuous n。and thinking of n and
n are all unique。Which method do you like。kids。Tell your
desk mate about your preferred method。[Design intent] XXX'
own reports and comparisons。they can better XXX。anything is
possible。Once again。XXX.
III。Apply new knowledge and XXX.
XXX: Panda Baby wants to thank the children for helping it
calculate that there were still 4 windmills left。and said it would
invite the children to watch a movie。The little bear also asked the
children to pass a level to get a ticket.
Level one: Be a careful person。do the first n on page 13 of
the textbook.
3
n: (1) What are the requirements of the n?
2) What is the result?
3) Why circle it like this?
Level two: Who is the fastest。Do the second n.
n: 1) Observe the n。what do you find?
2) Complete it independently.
XXX: Sharp eyes
Show the ns 12-8=16-8=15-8=
n: 1) Let the XXX(Board topic: subtracting eight from teens)
2) According to the pattern。fill in the XXX. 3) Quickly say the answers based on the pattern.
XXX: ns。you got the ticket。The students happily entered
the cinema to watch the movie。and found that some children
could not find their seats。Can we help them。Please complete
the first n of exercise three on page 15 of the textbook。Watch a
short movie。[Design intent] Using real-life problems and game
XXX' interest。we also XXX to use the "breaking ten" and
"XXX" methods to solve problems。XXX.
XXX
XXX: What did you learn in this class?
Student 1: I learned how to use the "XXX" method to
calculate 12-8=4.
Student 2: I XXX how to use the "breaking ten" XXX.
Student 3:。