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1、1/40 课题：加法交换律和结合律（共 1课时）主备人：颜友生教案任务分析教学目标基础目标结合具体的情境，引导学生认识和理解加法交换律和结合律的含义核心目标能用字母式子表示加法交换律和结合律，初步学会应用加法交换律和结合律进行一些简便运算延伸目标体验自主探索、合作交流，感受成功的愉悦，树立学习数学的自信心，发展对数学的积极情感。培养学生观察，比较，抽象，概括的初步思维能力教案重点认识和理解加法交换律和结合律的含义。教案难点引导学生抽象，概括加法交换律和加法结合律课前准备多媒体课件。教案过程设计教师与学生双边活动设计二次备课一、目标导学(一)引入新课1、故事导入，提出问题师：动物王国要进行一次计
2、算比赛，小猪，小猴，小羊，小熊都参加了这些比赛，这次比赛是由大象爷爷出题的。比赛开始了，大象一下子在黑板上出了8道计算题，没想到不一会的功夫，平时一向呆头呆脑的小猪举起了答题板，高兴地说：“我算完了”，其他小动物见状都目瞪口呆了。一向聪明伶俐的小猴一下子惊讶道：“啊!算得这么快。”12+25 25+12 500+300 500+300 30+20 20+30 1200+650 650+1200 大家想知道为什么吗？今天我们就来学习加法运算定律，加法交换律。2、揭示课题：加法交换律3、(二)展示目标（见教案目标1）二、自主学习2/40（一）出示自学提纲自学提纲（自学教材P28 页例 1，P29
3、页例 2并完成自学提纲问题，将不会的问题做标注）1、根据例1情境图中信息列出算式。2、用你喜欢的方法尝试计算3、同桌交流自己的算法4、教师板书出学生的算式及答案40+56=96（千 M）56+40=96（千 M）5、对比上面的两道算式，你发现了什么？用自己的话说一说。6、根据例2情境图中信息列出算式。7、用你喜欢的方法尝试计算8、同桌交流自己的算法9、教师板书出学生的算式及答案88+104+96 88+（104+96）=192+96 =88+200=288 =288 10、对比上面的两道算式，你发现了什么？用自己的话说一说。（二）学生自学（学生对照自学提纲，自学教材P28 页例 1，并完成自学
4、提纲问题，将不会的问题做标注）（学生自学，教师在不干扰学生的前提下巡回指导，发现共性问题，以掌握学生学情）（三）自学检测 1、填空 387+425=（）+387 525+（）=137+525 300+600=（）+（）（）+65=（）+35 甲数+乙数=（）+（）偶数+（）=奇数+（）2、连线56+68 150+（25+75）150+25+75 50+B B+50 68+56 A+B+100 A+(B+100)三、合作探究（一）小组互探（自学中遇到不会的问题，同桌或学习小组内互相交流。把小组也解决不了的问题记好，到学生质疑时提出，让其他学习小组或教师讲解。）文档编码:CM5E1X8H6B7 H
5、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
6、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
7、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
8、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
9、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
10、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
11、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X53/40（引导学生正确地计算，鼓励学生分工合作，探索交流，教师巡回辅导，发现、收集学生存在的问题）（二）师生互探1、解答各小组自学中遇到不会的问题。（1）让学生提出不会的问题，并让学生解决。（2）教师引导学生解决学生还遗留的问题。（3）如何用字母表示加法交换律和结合律？（4）用字母表示这些运算定律有什么优点？2、教师有针对性地请不同做法的同学汇报自己的解题思路与方法。四、达标训练（1-3 题必
12、做，4 题选做，5 题思考题）1、填空题。（1）360+482=（）+360 128+275=125+（）（2）（）+78=78+149 133+（）=125+133（3）78+25+22=78+（）+25（4）376+175+25=376+（+）2、连线。38+175 147+（72+28）147+72+28 47+B B+47 A+(B+100）A+B+100 175+38 3、简便计算下面各题。91+89+11 238+168+32 52+27+73 285+15+77+23 课堂小结：谈谈你有什么收获？有什么感受？还有问题吗？（学生总结不完整的地方，教师要适当补充总结）五、堂清检测（一
13、）出示检测题（1 2题必做，3 题选做，4 题思考题）1、填空（1）450+320=（）+450 65+95=95+（）（2）（）+100=100+150 250+（）=125+250（3）78+25+22=（78+）+（）（4）495+125+75=495+（+）2、下面的哪些算式符合加法结合律，哪些算式符合加法交换律。文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
14、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
15、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
16、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
17、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 H
18、Z7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3
19、X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X54/40（1）A+（30+9）=A+
20、30+9 （2）15+(7+B)=(15+7)+B（3）84+C=B+84（4）10+20+30+40=10+(20+30)+40 3、连线。87+22+78 （79+83)+17 498+125+75 498+(125+75)(138+136）+162 87+（22+78）79+（83+17）138+136+162 4、简便计算。81+79+21 689+132+68 98+72+28 215+85+73+27（二）堂清反馈：作业布置教材 P30 页习题。板书设计:加法交换律和结合律40+56=96（千 M）56+40=96（千 M）a+b =b+a （88+104）+96=88+(104+
21、96)(a+b)+c=a+(b+c)课外作业：教后反思：文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4
22、N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8
23、H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4
24、N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8
25、H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4
26、N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8
27、H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X55/40 课题：加法交换律和结合律练习课（共 1 课时）主备人：颜友生教案任务分析教学目标基础目标通过练习，加深对加法交换律和结合律含义的理解，能应用加法交换律和结合律进行简便运算核心目标能比较熟练用字母式子表示加法交换律和结合律，初步学会应用加法交换律和结合律进行一些简便运算延伸目标体验自主探索、合作
28、交流，感受成功的愉悦，树立学习数学的自信心，发展对数学的积极情感。培养学生观察，比较，抽象，概括的初步思维能力教案重点加法交换律和结合律的含义及表示的方法。教案难点能熟练的运用运算定律做相关的简便运算。课前准备小黑板或课件。教案过程设计教师与学生双边活动设计二次备课文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM
29、5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M
30、9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM
31、5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M
32、9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM
33、5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M
34、9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X56/40 一、目标导学（一）引入新课今天我们对“加法运算定律进行复习”（揭示课题）（二）展示目
35、标（见教案目标1）二、自主复习（一）出示复习提纲复习提纲（快速浏览教材P28-30 页内容，并完成复习提纲问题，将不会的问题做标注）1、概括出所学的加法运算定律，看谁说得既全面又准确。2、想一想（1）什么是加法交换律，什么是加法结合律。（2）加法交换律用字母怎么表示？加法结合律用字母怎么表示？3、说一说下面的算式用了哪些运算定律？50+A=A+50 30+A+70=(30+70)+A a+(60+40)=a+60+40 50+70+150+230=（50+150）+（70+230）4、用简便计算下面各题。133+167+98 212+174+188 109+116+84 97+103+89 5
36、、解决问题。小明看一本故事书第一天看了56 页，第二天看了125页，第三天看了 44 页正好看完，这本书有多少页？（用两种方法解答）（二）学生自主复习（学生对照复习提纲，浏览教材P2830 页内容，并完成复习提纲问题，将不会的问题做标注）三、合作探究（一）小组互探（自学中遇到不会的问题，同桌或学习小组内互相交流。把小组也解决不了的问题记好，在学生质疑时提出，让其他学习小组成员或教师帮助解决）。（引导学生选择合适的方法，鼓励学生分工合作，探索交流，教师巡回指导，及时了解学情）（二）师生互探1、解答各小组自学中遇到不会的问题。2、教师有针对性地请同学汇报自己的解题思路与方法。3、引导组织学生将加法
37、交换律和结合律用文字叙述，并用字母表示。文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5
38、文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7
39、T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5
40、文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7
41、T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5
42、文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7
43、T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X57/40 四、典例示范例 1：填一填。87+156+44=87+(+)140+(160+275)=(140+160)+275 规律总结：三个数相加可以把能凑成整十或整百，整千的相结合这样更简便些。例 2：判断。1、83+175+17=83+17+175 这是根据加法结合律进行简便计算的。（）2、435+122+88=4
44、35+122+88 （）3、130+（170+244）=（130+170)+244 ()4、25+a=b+25 这是根据加法的交换律（）当堂小结：谈谈自己的收获！还有什么问题？（学生总结不到位的，教师可作补充总结）五、达标检测（一）出示检测题（12题必做题，3题选做题，4题思考题）1、填空。（1）720+280=（）+720 250+（）=378+250 （2）147+275+53=147+（）+275（3）89+136+（）=89+(+64）（4）495+232+168=495+(+)（5）105+77+95=105+95+77 是根据（）进行简便运算的。（6）439+233+67=439+
45、（233+67）是根据（）进行简便运算的。2、连线。87+22+78 （79+83）+17 498+125+75 498+（125+75)(138+136)+16287+（22+78)79+(83+17)138+162+136 3、用简便方法计算。91+79+21 283+132+68 375+148+125 282+47+53+118 4、解决问题。（思考题）有一本故事书共232 页，小明第一周看了46 页，第二周看了54页，还剩下多少页没看？（用简便方法计算）（二）检测反馈：作业布置文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6
46、B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8
47、R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6
48、B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8
49、R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6
50、B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8R4D3X5文档编码:CM5E1X8H6B7 HZ7T4S1U4M9 ZF4N8