《和的奇偶性》是苏教版五年级下册新增的内容,是在学生学习了《倍数和因数》单元后安排的一次探索规律的活动。既是规律教学课,大抵是按经历猜想——通过举例——进行验证——归纳总结的数学活动过程,从而得出数学规律。然而这样的规律教学课,也因为套路明显,上不出新意,让笔者颇为困扰。前几天聆听了特级教师顾娟执教的《和的奇偶性》, “Parity and” is a new addition to the fifth grade of the Sujiao edition, which is an activity of exploring the law arranged after the students have studied “multiples and factors”. It is not only a regular teaching class but also a mathematical law that is based on the experience of conjecture - through examples - to verify - to summarize the mathematical activity process. However, this regular teaching class, but also because of routines obvious, no new ideas, so I quite troubled. A few days ago to listen to the special teacher Gu Juan coached “and parity”