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    秦仕祥主页 >> 文章 >> 教学论文 >> 浏览信息《三位数乘两位数(1)》

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    星期一   晴天 
    主题 三位数乘两位数(1)

    教师:秦仕祥                            总第      课时  

     

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                

    课题            

     

                

                
                

    三位数乘两位数            

     

                

                
                

    课时            

     

                

                
                

    1            

     

                

                
                

    授课时间            

     

                

                
                

    201227            

     

                

                
                

    教学            

     

                

                

    目标            

     

                

                
                

    1使学生应用两位数乘两位数的计算原理,自主探究出三位数乘两位数的计算道理,并能归纳出三未数乘两位数的计算法则。            

     

                

                

    2使学生掌握三位数乘两位数的计算方法,并能正确、熟练地进行竖式计算。            

     

                

                

    3让学生在探究三位数乘两位数的过程中,磨砺学生的思维,发展学生的迁移能力、思维能力。            

     

                

                
                

    重点            

     

                

                

    难点            

     

                

                
                

    三位数乘两位数的算理及计算方法。            

     

                

                
                

                

     

                

                

    教具            

     

                

                

    学具            

     

                

                

                

     

                

                
                

    多媒体课件            

     

                

                
                

    板书            

     

                

                

                

     

                

                

    设计            

     

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                
                

    预习            

     

                

                

    要求            

     

                

                
                

                

     

                

                
                

    教师活动内容、方式            

     

                

                
                

    学生活动内容、方式            

     

                

                
                

                  

     

                

                
                

    一、训练、复习            

     

                

                

    1口算(略)            

     

                

                

    2出示铺垫题            

     

                

                

                                                                               

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    问:这是什么地方?(告诉学生是一个住宅小区)            

     

                

                

    你想知道这个小区有多大吗?好!现在秦老师给你一些信息,自己解决这个问题吧!            

     

                

                

    出示:月星小区有15幢楼,平均每幢楼住44户,这个小区有多少户?            

     

                

                

    怎么列式?            

     

                

                

    怎么计算44×15

                

                

     

                

                

                

     

                

                

    怎样计算最方便?你会用竖式计算吗?            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    3把“每幢住44户”改成“每幢住144户”            

     

                

                

    怎么列式?            

     

                

                

    这道算式与以前学习的乘法算式有什么区别?            

     

                

                

    二、导入新课            

     

                

                

    今天我们就来研究三位数乘两位数的计算。            

     

                

                

    三、进行新课:            

     

                

                

    1研究144×15的算理

                

    根据以前学习的两位数乘两位数的计算,思考一下:你打算怎么计算144×15            

     

                

                

                

     

                

                

    这是计算的道理,但是在计算时还可以怎样算?你会用竖式计算吗?            

     

                

                

                

                                                                                                                
                            
                            

    1  4  4

                            

    × 1  5

                            

    7  2  0

                            

    1  4  4

                            

    2  1  6  0

                            
                            
                                                                                                                                                                                                                                        
                            
                            

    这一步算的是什么?0为什么写在个位上?

                            
                            
                
                                                                                                                            
                            
                            

    这一步算的是什么?4为什么写在个位上?

                            
                            
                
    评讲            

     

                

                

                

     

                

                

                                      

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    44×15比较,计算时有什么相同的地方?

                

         有什么不同的地方?            

     

                

                

    你们会计算吗?            

     

                

                

    2、练习            

     

                

                

    1页:想想做做 1            

     

                

                

    1页:想想做做 2            

     

                

                

    2页:3 4            

     

                

                

    四、师生总结            

     

                

                

    今天我们学习了什么知识?怎样计算三位数乘两位数?            

     

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    学生列式44×15            

     

                

                

    学生思考回答:44×5220            

     

                

                

    44×10440             

     

                

                

     440220660            

     

                

                

                

                                                                                                                
                            
                            

    4  4

                            

    × 1  5

                            

    2  2  0

                            

    4  4

                            

    6  6  0

                            
                            
                                                    学生计算:            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    让学生列式144×15            

     

                

                

    学生思考回答。            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    学生思考得出:144×11440            

     

                

                

    144×5720            

     

                

                

     14407202160            

     

                

                

    学生尝试计算            

     

                

                

                

     

                

                

                

     

                

                

    学生思考并回答?            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    学生思考回答:相同点:都是分三步计算(两步乘一步加);不同点:44×15每次只乘两次。144×15每次要乘三次。

                

                

     

                

                

    学生计算后评讲。

                

    学生先找错误点,再订正,最后评讲。

                

                

     

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                 

     

                

                

                

     

                

                

     

    秦仕祥 发表于:2012-2-20 20:57:13

    评论 

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