案例笔者听了一节《100以内进位加法》的研究课,教师通过海底世界“这一情境引入后,引导学生列出求黄金鱼和红金鱼一共有多少条的算式:14+28。之后,教师让学生分组讨论算法,不一会儿,涌现出多种方法:一组:我们组用摆小棒的方法,1捆加2捆等于3捆,4根加8根等于12 Case Study After listening to a section titled ”Lessons Within 100 plus Additions, Teachers Introduced Underwater World", we guide students to formulate the formula for calculating the total number of goldfish and red goldfish: 14 + 28 , Teachers allow students to discuss the algorithm in groups. In a short time, a variety of methods have emerged: one group: the group we put with a small stick, a bundle plus two bundles equal to three bundles, four plus eight equal to 12