掌握算理是培养学生数学能力的基础,讲算理是数学教学的一项根本任务。然而,在实际教学中,不少教师却往往重“算法”,轻“算理”,甚至只讲“算法”,不讲“算理”。这样教学,学生只知其然,不知其所以然。下面以笔者在学校听课时的笔记为例,阐述一些浅见。 课题:同分母分数加减法 Grasping arithmetic is the basis of cultivating students' mathematical abilities, and speaking arithmetic is a fundamental task of mathematics teaching. However, in actual teaching, many teachers tend to emphasize the “algorithm”, the light “arithmetic”, and even the “algorithm”, not the “arithmetic”. This teaching, students only know it, I do not know why. The following notes in my school lectures as an example, explain some humble opinion. Question: same denominator fraction addition and subtraction method