各数的认识(二).pdf

1/5 11-20各数的认识江苏省常州市戚墅堰中心小学刘云燕教案内容 由江苏教育出版社出版的义务教育课程标准实验教科书小学数学第一册 P72页的例题，P7273页“想想做做”的习题。教材简析 本课是在学生能正确数出1120 各数并会读数的基础上进行教案的。重点是通过数小棒、操作计数器，使学生认识数位，进一步认识 1120 各数的组成，学会1120 各数的写法。这样的安排符合学生的认知特点，重点突出。教案目标 1、通过动手操作，经历认识1120 各数的组成的学习过程，能够正确地书写 11-20各数。2、认识计数器，了解数的十进制，认识数位，培养学生的观察能力和分析能力。3、愿意提出问题，并质疑问难。教案过程 一、揭示课题1、同学们，今天这节课我们继续来认识11-20 各数。（板书课题：1120各数的认识）二、操作探究，学习新知1、谈话：老师要告诉同学们一个消息：再过几天就是动物运动会开2/5 幕的日子了，动物运动员们早早地来到了比赛地，希望熟悉一下环境，先热热身以取得更好的成绩。运动会组委会也给每个运动员准备了一间房间，使运动员们能得到很好的休息。走，我们一起去看看它们都住几号房间？（出示P73第 7 题加入小白兔住第13 号房间，小狗住第 11号房间）2、提问：小白兔住第几号房间？（13 号房间）你能用小棒摆一摆13 吗？（学生动手摆小棒13）3、教案 13的组成（1）认识数位谈话：13 你是怎么摆的呢？（学生回答教师图片出示）这1 捆就表示什么？（1 个十）它所对着的位置，我们给起了个名字，叫做“十位”。（教师板书：十位）那这3 根表示什么呢？（3 个一）它所对着的位置也有一个名字，叫做“个位”。（教师板书：个位）（2）认识计数器谈话：13，我们还可以用计数器来表示。（出示计数器）你能在计数器上找到个位和十位吗？（小组互相指、说）（3）小结：从右边起，第一位是个位，第二位是十位。（4）在计数器上表示出13 提问：你能在计数器上表示出13 吗？（小组讨论并操作）你们是怎么拨的？（教师根据学生回答在计数器上画出珠子）文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 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ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D23/5 十个为什么在十位上拨1个珠子，这 1个珠子表示什么呢？（板书：1个十）个位上为什么拨了3 个珠子，这3 个珠子表示什么呢？（板书：3 个一）1 个十和 3 个一合起来就是多少？（13）（5）教案 13的写法谈话：对着计数器你会写13 吗？（学生板演）你为什么这么写？（学生发表意见）（6）13的组成提问：13里面有几个十和几个一？4、教案 11的组成（1）小狗住几号房？11，你能用计数器来表示吗？（小组讨论并操作）（2）你们是怎么拨的？（教师根据学生回答在计数器上画出珠子）十个（3）你能对着计数器写11吗？（4）十位上的“1”和个位上的“1”表示的意思一样吗？（5）11里面有几个十和几个一呢？5、自学 12、14-20 各数的组成（1）在上节课认识的11-20 这些数中，你最喜欢哪个数，用水笔在印有计数器的纸上画一画，然后在计数器下面把这个数写出来，文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D24/5 好吗？（2）学生独立操作（3）汇报，贴出作业纸（4）12、14-19 略讲（5）20，为什么在十位上拨2个珠子？个位上为什么没有拨珠呢？（6）20里面有几个几呢？三、巩固练习，掌握新知1、P72 “想想做做”2 谈话：这是什么？（出示数轴）这根数轴上缺了好几个数，我们来猜猜这些数，谁猜对了，谁由就来填，看谁猜得对，填得多，好吗？（1）比 11大，比 13小的数是几？（2）十位上是 2，个位上是 0，这个数是几？（3）1 个十和 4 个一合起来是多少？提问：其余的，你能出个问题，让大家猜一猜，填一填吗？谈话：请同学们仔细观察一下，看一看18 离 10 近还是离20近？为什么呢？13 呢？2、P73 “想想做做”7 十个文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D25/5 谈话：你能帮运动会组委会把每个房间都编好号吗？看看其它动物运动员们都住几号房呢？（学生独立完成并汇报核对）四、全课小结1、同学们，今天这节课你有什么收获吗？文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 ZY10J4Q5L5D2文档编码:CG7V5K2M7Z8 HO6K5I4V5R3 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