《倍的认识》是北师大版二年级上册第六单元的内容,而“倍”是数学教学中重要的概念。小学生对“倍”的认识比较陌生,建立“倍”的表象认识有一定的难度。另外,“倍”的概念又是从“加法结构”到“乘法结构”过渡的关键期,因此小学生学习“倍”存在着一定的困难。近期,我执教了《倍的认识》一课,课上出现的一个小问题让我受到了不小的启发。一次课上,我告诉学生要玩一个比一比的游戏,先是用4和3比,然后用5和3比,最后用6和3比。我让学生仔细观 “Times of understanding” is the content of the sixth unit of the second grade on the Beijing Normal University edition, and “double” is an important concept in mathematics teaching. The primary school students are rather unfamiliar with the knowledge of “times”, and there is some difficulty in establishing the appearance of “times”. In addition, the concept of “times ” is a critical period of transition from “addition structure ” to “multiplication structure ”, so there are some difficulties for pupils to learn “times ”. Recently, I coached a lesson of “Times Recognition”, and a small problem that appeared in class made me feel inspired. In a class, I told the students to play a game with a ratio of 4 to 3, then 5 to 3 and finally 6 to 3. I let the students look carefully