在日常的学习、工作、生活中,肯定对各类范文都很熟悉吧。写范文的时候需要注意什么呢?有哪些格式需要注意呢?以下是小编为大家收集的优秀范文,欢迎大家分享阅读。
数独教学设计ppt篇一
教材第110页例2及相关内容。
1.通过观察、分析等活动,让学生用推理解决一些简单游戏中的数学问题,从而经历稍复杂的推理过程。 2.让学生在推理的过程中不断尝试、调整,学会按一定的方法进行推理,进一步体验推理的作用。 3.在简单推理的过程中,培养学生观察、分析、推理和有条理地进行数学表达的能力,学会有序地、全面地思考问题。
本节课是在学生已有知识和经验的基础上,继续让学生通过操作、观察等活动探索数字的排列规律。
运用排除、猜测等方法推算出所在方位的数字是几。
培养学生有顺序地、全面思考问题及有条理地进行数学表达的能力。
教学过程:
师:今天上课,老师给你们准备了一个宝盒。(摇一摇)想打开吗?
师:要打开宝盒需要四个数字的秘密,这些数字就藏在今天的游戏闯关中,有信心获得密码吗?
(一)第一关,首接触
规则:每行、每列必须有1~4这四个数,且每个数只出现一次。
1、研读规则
提问:这是要我们做什么?(出示规则)引导学生阅读规则并分析规则的含义,强调“行”、“列”
2、师:你能填这个空吗?师:你怎么知道的?
师:这个空可以填4吗?为什么?(指着第二列)
3、师:第一列可以填几呢?为什么?第二列呢?
孩子们,真了不起,你们轻轻松松的就闯过第一关,下面我们来看第二关。
(二)第二关,初印象
打印版
规则:在右面的方格中,每行每列都有1~3这三个数,并且每个数在每行每列都只出现一次。
1、阅读规则并理解
2、你能填哪个空?你怎么知道的?同桌交流。
3、学生汇报,分别说能填哪个空,并说明自己的思维过程。
4、为什么这个空不好填呢?(指着右下角的空)引导总结:先填每一行每一列只有一个要填的空。你们的思维很缜密,老师为你们点赞,来看第三关。
(三)第三关,攻难关
要求:使每一行、每一列都有1~3这三个数字,并且在每行每列中不重复出现。
1、你会填哪个空?
2、同桌讨论哪个空怎么填
3、汇报,学生在台前讲解自己的会填的空,并说明想法
4、引导总结:这样的空怎么填:既要看这个空所在的行,又要看这个空所在的列
(四)第四关,试着做
在右面的方格中,每行、每列都有1~4这四个数,并且每个数在每行、每列都只出现一次。b应该是几?
1、阅读规则,并说出自己的.理解
2、你打算从哪里入手?我们应该如何思考?
3、学生的回答,教师指出:先看哪一个空格所在的行和列出现了三个不同的数,就能确定这个空格应填的数。
引导学生发现:哪一行或哪一列出现了哪三个不同的数?(a所在的行和列)
推理明确:a的竖列另两格分别是1和3,a可能是几?(2或4)再看a的横行另两格是b和2,a只能是几?(4)
4、将数字填入表格。
5、学生按照以上方法自主探索b是几,并将数字填入表格。全班交流说说怎样确定b是几的?
6、师生小结,明确思路:先找已知三个不同数的,确定第四个数,依次推出结论。
7、根据刚才推算的方法,你能填出其他方格中的数吗?
(1)先独立思考,再小组交流。
(2)全班汇报,体会推理方法。
知识链接:今天我们玩的这个游戏,就是———数独(板书)
介绍数独的来历:“数独”一词来自日语,意思是“单独的数字”或“只出现一次的数字”。它就是一种填数字游戏,是瑞士数学家欧拉发明的。因可以培养观察力和逻辑思维能力,现在已经成为一种风靡(mí)
打印版
全球的游戏。每年世界各地都会举行各种数独大赛。
师:四个密码都找回了,现在可以打开宝盒了。(打开宝盒,展示宝盒里的东西)想要吗?
(一)完成做一做
那么请同学们完成教材第110页“做一做,做对以后就可以得到宝盒里的宝物了。提醒学生:先找出已知三个不同数的行和列,再进行推理,再次明确推理的思路。
同桌两人可以先讨论再完成,汇报时要重点说一说是怎样思考的,同时注意引导学生将不同的填法一一找出来。
(二)小结
今天这节课你们学会了什么?
数独教学设计ppt篇二
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