《《口算乘法(二)》教学设计.pdf》由会员分享,可在线阅读,更多相关《《口算乘法(二)》教学设计.pdf(4页珍藏版)》请在淘文阁 - 分享文档赚钱的网站上搜索。
1、口算乘法(二)教学设计一、教学目标(一)知识与能力使学生理解两位数乘整十数、整百数(不进位),整十数乘几百几十数(不进位)的算理,掌握口算方法。(二)过程与方法学生利用已有知识经验探究新知,经历两位数乘整十数、整百数(不进位),整十数乘几百几十数(不进位)的多种算法,体会算法多样化。(三)情感态度和价值观使学生在探索算法和解决问题的过程中,感受数学在日常生活中的运用。二、教学重难点教学重点:熟练掌握两位数乘整十数、整百数(不进位),整十数乘几百几十数(不进位)的口算方法。教学难点:自主探索整十数乘几百几十数(不进位)的口算算理。三、教学准备口算卡、主题图等。四、教学过程(一)口算比拼,复习旧知
2、1出示口算卡。237=22 4=23 4=18 5=1303=160 5=4 240=2 450=得出答案的同时,个别题要求学生说出口算过程。2揭示课题。两位数和整百整十数乘一位数的口算算法,同学们掌握得都很不错,我们今天继续学习口算乘法。板书课题:口算乘法(二)【设计意图】课前梳理巩固两位数乘一位数、几百几十数乘一位数的口算,既是对旧知的复习,也是本节课学习内容的一个铺垫。(二)情境导入,探究新知1创设情境,探究算理。超市进了一批橙子,请大家帮忙整理整理。(1)出示主题图。(2)观察主题图,说说图中的数学信息并提出问题。(3)学生列式汇报,教师板书:610=(4)小组合作,探究算理。怎样才能
3、算出得数?小组合作来试一试吧!引导学生观察主题图,得出不同算法。(5)小组代表汇报口算方法,教师根据汇报板书。算法预设:方法一:10 盒橙子,可以先算9 盒的个数,再加上 1 盒的个数。69=54,54+6=60(个)。方法二:方法三:先不看0,16=6,再在结果后加上0,所以 6 10=60(个)。【设计意图】情境图直观生动,让学生在具体情境中抽象出数学问题,便于学生理解算理,探究多种算法。2深入练习,知识迁移。(1)计算下列各题。510=9 10=18 10=40 10=(2)指名汇报各题口算方法。(3)说说你喜欢哪一种方法,说说原因。【设计意图】放手让学生通过小组合作的方式,自主探究口算
4、的方法,体会算法多样化,发散学生思维。学生在练习之后,体会并掌握最简便的口算方法。3层层递进,探究新知。(1)出示主题图:超市预定的苹果也到货了,同学们愿意帮帮忙吗?文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L
5、8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7
6、H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X
7、1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N1
8、0L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4
9、H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V
10、4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9(2)观察主题图,说说图中的数学信息并提出问题。(3)学生列式汇报,教师板书:12 20=(4)想
11、一想:1220 应该怎样口算呢?引导观察主题图,思考多种方法。先独立想一想,可以小声地说一说。(5)学生汇报口算方法,教师板书。算法预设:方法一:12 2=24,2410=240(个)。方法二:【设计意图】现实情境是学生列算式的依据,通过直观的情境图,加深学生对情境的理解,鼓励学生从不同角度思考,得出不同的算法,再通过练习,优化算法。(6)再思考:超市进了200 盒苹果,每盒12 个,一共有多少个?学生独立列式,思考口算方法。(7)与同桌交流口算方法,说说口算时是怎么想的。(8)学生总结口算方法,并说说自己喜欢的算法。(三)练习反馈,知识运用1指导学生完成“做一做”。(1)独立思考完成第一列和
12、第三列。(2)根据前面学习的经验,你能说一说你想怎么计算它们的结果吗?(3)寻找两题之间的区别和联系,说一说,再完成第二列和第四列的计算。文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H
13、3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1
14、N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10
15、L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H
16、7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4
17、X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N
18、10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9【设计意图】在掌握了两位数乘整十数的口算方法基础上,引导学习探究计算方法,放手让学生自主探究整百数、几百几十数乘两位数的口算方
19、法,培养学生独立思考的能力,真正让学生成为课堂的主人。2育苗路小学安排三年级同学去游乐园玩,三(1)班有 52 人,三(2)班有 50 人,三(3)班有 58 人,游乐园的游乐项目票价如下:(1)三(2)班同学一起去玩蹦蹦床,交给售票员1000 元,够吗?(2)三年级同学一同去玩旋转木马,需要花多少钱买票?(3)还能提出什么数学问题?【设计意图】让学生进一步巩固两位数乘整十数、几百几十数的口算方法,并运用所学知识解决生活中的简单问题,体会数学知识和现实生活的密切联系。(四)回顾所学,积累经验这节课我们解决了不少生活中的问题。通过学习,你收获了什么?文档编码:CG1N10L8Z7R7 HL1I4
20、H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V
21、4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1
22、N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1
23、I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X
24、4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:C
25、G1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9文档编码:CG1N10L8Z7R7 HL1I4H7H3X1 ZK5X4V4X1N9
限制150内