一、运用感性材料,建立表象小学生从对几何形体的感知中获得了印象,并保留在头脑中成为表象。表象的重新组合或再造的心理过程,是学生空间概念形成的重要基础。教学中应注意以下两个方面:第一、重视启蒙阶段对几何图形的观察。通用教材中几何知识是结合认数与计算编排的,一年级 First, the use of perceptual material, the establishment of representation Pupils from the perception of geometry gained the impression, and remain in the mind to become an appearance. The reorganization of appearance or the psychological process of reengineering is an important basis for the formation of the concept of student space. Teaching should pay attention to the following two aspects: First, pay attention to the initial stage of the geometry of the observation. Generic textbook knowledge of geometry is combined with the recognition and calculation of arrangement, the first grade