“概念起始课”是指小学数学知识体系中某一领域的第一节课,通过“意义”建构的方式,帮助学生掌握最基础的初级概念,也叫起始概念。“几分之一”这部分内容是分数知识中最为基础的内容,它是在学生掌握了一些整数知识的基础上初步认识分数。如何降低门槛,激发兴趣,让学生积极主动去建构分数概念,开课导入的目标定位就显得尤为重要。 “Concept Start Class ” refers to the first class in a field of primary school mathematics knowledge system, through the “meaning ” way to help students master the most basic concepts, also known as the initial concept. “A few percent ” This part is the most basic content of the fractional knowledge, it is based on the students master some integer knowledge based on the initial recognition of scores. How to lower the threshold, to stimulate interest, let the students take the initiative to construct the concept of scores, the introduction of the target orientation is particularly important.