【问题产生的背景】《义务教育数学课程标准(2011年版)》明确提出:通过义务教育阶段的数学学习,学生能获得适应社会生活和进一步发展所必需的数学的基础知识、基本技能、基本思想、基本活动经验。思想的感悟和经验的积累是隐性的东西,光靠老师讲是不行的,必须自己感悟,光听是不行的。我们要组织一些教学活动,让学生参与讨论,这是形式,不是目的,这个形式是为了让孩子们自己想问题,为了让他们相互 [Background of the Problem] The Standard of Compulsory Education Mathematics Curriculum Standard (2011 Edition) states clearly: Through the mathematics study in the compulsory education phase, the students can acquire the basic knowledge, basic skills and basic ideas of mathematics necessary for social life and further development Basic experience. The comprehension of thoughts and the accumulation of experience are implicit things. It is impossible for teachers to rely on their own opinions. They must realize their own feelings and listen to them without listening to them. We have to organize some teaching activities for students to participate in discussions. This is a form and not an end. This form is for children to think about the problem and to make them interact with each other