“认识厘米”是青岛版《数学》一年级下册的学习内容。“长度”概念是研究图形度量特征的起始,以此为基础逐步产生二维空间以及三维空间大小的度量,即“面积”“体积”的度量。认识“厘米”又是认识“长度”的起始,是认识图形度量特征的重中之重。虽然学生对比较“细长”物体长短有一定的操作经验,对“长度”有初步感知,但再进一步地认识某物体的长度还缺少“抽象”出“长度”的经验。皮亚杰指出:测量是一种涉及客体的活动 “Understanding cm ” is the Qingdao version of “mathematics” first grade next book learning content. “Length ” concept is to study the beginning of the characteristics of the graphical measurement, and based on this two-dimensional space and the measure of the size of the three-dimensional space are gradually generated, that is, the measure of “area ” “volume ”. Recognizing “cm ” is the beginning of recognizing “length ”, and it is the most important thing to recognize the characteristics of graph measurement. Although students have some experience in working with slender objects and have initial perceptions of “length ”, they still do not know the length of an object. “Abstraction ” “Length ” experience of. Piaget pointed out: Measurement is a kind of activity involving the object