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在小学的数学教学中,多数老师会觉得“空间与图形”的教学往往是个难点。学生或难以建立正确的几何概念,或对众多繁杂的计算公式难以记忆,互相混淆;有时就算记熟了公式,在解决实际问题的时候又往往是一筹莫展,乱套公式。通过这几年自己在教学中所总结的经验,我认为,出现这样的情况其主要原因是教师在教学中对学生的空间观念训练不够。何谓空间观念呢?《数学课程标准》对此作了具体描述:能够由实物的形状想象出几何图形,由几何图形想象出实物图形,进行几何体与其三视图、展开
In primary school mathematics teaching, most teachers will think “space and graphics ” teaching is often a difficult task. Students may find it difficult to establish the correct geometric concept or to memorize and comprehend a large number of complicated formulas. Sometimes, even when formulating the formulas, students often fail to solve the practical problems when they formulate formulas. Through the experiences we have summarized in the teaching in the past few years, I think that the main reason for such a situation is that teachers do not train enough students’ space concepts in their teaching. What is the concept of space? “Mathematical Curriculum Standards” made a specific description of this: the physical shape can be imagined from the geometry, the geometry of the physical image from the imagination, geometry and its three views, expand