理解并掌握数学概念的核心是把握概念实质,而不仅仅掌握概念形式的、描述的定义。就如学生会说“物体所占空间的大小叫物体的体积”不等于学生理解“体积”这个概念,教师把握数学概念的实质非常重要。小学数学所涉及的概念类型、层次各不相同,笼统地论述“数学概念的实质”既论述不清也没有意义,一个重要方法是按照概念的类型分别论述某些数学概念的实质。自然数是小学阶段的一个重要内容,在小学阶段 Understand and grasp the core of mathematical concepts is to grasp the concept of the essence, not just grasp the conceptual form, description of the definition. Just as the student would say, “The size of the space occupied by the object is called the volume of the object.” This does not mean that the student understands the concept of “volume”. It is very important for the teacher to grasp the essence of the mathematical concept. The types and levels of concepts involved in elementary mathematics are not the same. Generally speaking, “the essence of mathematical concepts” is neither clear nor meaningful. An important method is to discuss the essence of some mathematical concepts separately according to the types of concepts. Natural numbers are an important part of primary school, in primary school