参与与体验是数学课堂教学的核心内容,只有让学生积极参与,积极体验知识的形成过程,这样,才能凸现学生的主体地位,才能最大限度地发挥学生的学习主动性和积极性,才能达到有效学习的目的。前段时间,我有幸聆听到一节名师执教的公开课,内容是四年级下册的“三角形任意两边的和大于第三边”。本节课是在学生已经掌握了三角形的特征,获得了相应的知识与技能的基础上,进一步认识三角形的特点。设计时以“老师上班走哪条路最近”这个学生熟 Participation and experience are the core contents of the mathematics classroom teaching. Only by actively participating in the students and experiencing the formation of the knowledge can we highlight the students ’subjective status and maximize the students’ learning initiative and enthusiasm in order to achieve effective learning the goal of. Some time ago, I was fortunate enough to hear an open class taught by famous teachers about the fourth grade, “Any two sides of the triangle and greater than the third side.” This lesson is based on the students have mastered the characteristics of the triangle, access to the corresponding knowledge and skills, to further understand the characteristics of the triangle. Design to “Which way the teacher goes to work recently ” This student cooked