借助对应思想深度教学“鸡兔同笼”问题的策略

Strategies on Teaching “Chicken and Rabbit in a Cage” with Corresponding Thoughts

"鸡兔同笼"是人教版四年级下册数学广角一个"解决问题"的单元,具有渗透数学思想方法、积累活动经验等特点,教与学都有较大探究空间。实际教学中却存在部分教师新授课时讲授多种方法,而学生学习不得要领、学习后会照搬公式却不能深入理解的现象。同时部分学生也出现了认为理解原理没必要的应试教育思想。针对这些现象,从教师教学方式和学生思维发展的角度进行分析与思考,对该问题提出顺向思维过渡到逆向思维,画图法过渡到假设法等一些教学策略,以供参考。

"Chicken and Rabbit in a Cage"is a"solve problem"unit for Grade 4 primary students,which could be used to promote students’math thinking and accumulate life experience.In the actual teaching,it was found that because some teachers introduces too many solutions,students could only copy the formulas,but seldom understood the principle.To help the students better understand how to use the theory to handle problems of this type,the paper suggests to use those methods of mapping,hypothesis,straightforward thinking,and reverse thinking in teaching.