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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(3)》

    教学论文 | 评论(1) | 阅读(907)
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    星期一   晴天 
    主题 三位数乘两位数(3)

    教师:秦仕祥                            总第  3   课时

     

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                

    课题            

     

                

                
                

    三位数乘两位数(末尾有0的乘法)            

     

                

                
                

                

     

                

                
                

    3            

     

                

                
                

    授课时间            

     

                

                
                

                

     

                

                
                

    教学            

     

                

                

    目标            

     

                

                
                

    1、使学生理解和掌握末尾有0 的乘法的简便算法,并能理解简便算法的道理。

                

    2、能够应用简便方法计算末尾有0的乘法。

                
                

    重点            

     

                

                

    难点            

     

                

                
                

    计算的道理和计算的方法。

                
                

    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:口算。

                

    二、复习            

     

                

                

    计算下面各题

                

    36×58     542×35     60×58

                

      重点研究:60×58算简便?

                

                

     

                

                

                

     

                

                

                

                                                                                                                
                            
                            

    5  8

                            

    ×    6  0

                            

    3  4  8  0

                            
                            
                                                                            

     

                

                
                

    三、导入新课            

     

                

                

    今天我们继续研究三位数乘两位舒的乘法。

                

    四、进行新课            

     

                

                

    1出示图片:

                

                                                                            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                
                

    月星小区有850平方米的草坪,你知道草坪有什么作用吗?(净化空气)

                

    出示:这种草坪每平方米每天大约能释放氧气15克。你能提出一个数学问题吗?            

     

                

                

      出示:月星小区的草坪每天大约能释放氧气多克?            

     

                

                

    你会列式解决这个问题吗?            

     

                

                

    你是怎么计算的?            

     

                

                

      学生可能有两种算法:            

     

                

                

                

                                                                                                                
                            
                            

    一:    8  5  0

                            

    ×    1  5

                            

    4  2  5  0

                            

    8  5  0

                            

    1  2  7  5  0

                            
                            
                                                                                                                                                                            
                            
                            

    二:    8  5  0

                            

    × 1  5

                            

    4  2  5 

                            

    8  5 

                            

    1  2  7  5  0

                            
                            
                
                                        
                            
                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                
                

    这两种算法的道理是什么?            

     

                

                

                

     

                

                

                

     

                

                

    你喜欢哪种计算方法?为什么?用方法二计算时要注意什么问题?            

     

                

                

    2出示:每平方米草坪吸收二氧化碳20克。            

     

                

                

        你能提出什么数学问题?            

     

                

                

       出示:月星小区的草坪每天大约能吸收二氧化碳多少克?            

     

                

                

    你会解决吗?            

     

                

                

      评讲,采用下面的简便方法计算            

     

                

                

                

                                                                                                                
                            
                            

    8  5  0                        

     

                            

                            

    ×      2  0

                            

      1  7  0  0  0

                            
                            
                                                                

     

                

                

                

     

                

                

                

     

                

                
                

    重点解决为什么在最后添两个0            

     

                

                

    3、练习            

     

                

                

    5页想想做做  1234

                
                

                

     

                

                

                

     

                

                

    学生计算

                

    师生讨论得出:先把60×58看成586(个十)得到348个十,最后在348后面添上一个0

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    学生题问题:月星小区的草坪每天

                

    大约能释放氧气多克?

                

                

     

                

                

    学生列式计算:850×1512750(克)

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    学生思回答:方法二是先把850×15当成85(个十)乘151275个十,最后在没,末尾添上一个0            

     

                

                

    学生思考得出:用方法二计算简便,但是要记住最后要添0

                

                

     

                

                

    学生思考并提出问题。            

     

                

                

                

     

                

                

                

     

                

                

    学生列式计算。            

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

    引导学生思考得出:当成85个十乘2个十,十乘十是一个百,所以要添两个0            

     

                

                

    学生计算,然后评讲。

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                
                

                

     

                

                

                

     

                

                

                
                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

                

     

                

                

     

    秦仕祥 发表于:2012-2-20 21:12:43

    评论 

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