《方程》这节课是《义务教育课程标准实验教科书数学》四年级下册第七单元的第二课时。教材依据“由浅入深、循序渐进、螺旋上升”的教学原则,设置了“天平称物”等三个问题情境,让学生经历从具体到抽象的过程,逐步学会用方程表示简单情境中的等量关系。“会用方程表示简单情境中的等量关系”是《数学课程标准》第二学段的一个具体目标,也是《方程》这节课的教学内容。上课前,我思考了这样一个问题:如何使学生认识到方程是从现 “Equations” This lesson is “compulsory education curriculum standard experimental textbook mathematics” fourth grade Volume VII of the second unit hours. The teaching materials are based on the teaching principle of “from the shallower to the deepest, the gradual progress, the spiral upward”, and set up the three problem situations such as “balance weighing” so that students experience the process from concrete to abstract and gradually learn to express the simple situation In the same amount of relations. “Use Equations to Represent Equivalent Relations in Simple Situations ” is a specific goal of the second semester of the “Mathematics Curriculum Standard” and is also the teaching content of the “Equation” class. Before class, I pondered the question of how to make students recognize that the equation is from now