《中小学数学》(小学版)2010年第9期的《提倡“用π简化运算”》一文中,钟老师谈到了在有关圆周率的计算中作了一些改革和尝试。这引起了我的共鸣和思考。通过教学和了解学生以及进行问卷调查,我认为在圆柱圆锥的体积教学中,教师不可忽视计算指导。上周我听了一节“圆锥的体积”公开课,课始,教师先让学生根据圆柱体积公式进行列式,然后猜想圆锥的体积公式,并动手进行操作验证。实验器材:等底等 In “Elementary and Secondary Mathematics” (Elementary School Edition), 2010, No. 9, “Advocating” “Simplifying Operations with π”, Teacher Chung talked about some reforms and attempts made in the calculation of pi. This aroused my resonance and thinking. Through teaching and understanding of students as well as conducting questionnaires, I think that in the teaching of cylindrical conical volume, teachers can not ignore the calculation guidance. Last week I heard a section titled “Volume of Cone Open Class.” At the beginning of the class, the teacher first asked the students to set the column formula according to the cylinder volume formula, and then conjectured the cone volume formula and started the operation verification. Experimental equipment: such as the end