《口算乘法(二)》教学设计.pdf

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: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 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 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