数学教學中的“练习”,是使学生掌握知識的必經之路,这已是尽人皆知的了。这是因为,通过练习,不仅可以培养学生的应用技能和技巧,而且还能帮助他們深入地掌握理論知識。因此,課堂练习是教学过程中下可缺少的組成部分,必須使讲和练有机地結合起来。下面就如何根据教学的需要来設計与妥善安排练习,談談值得注意的几个問題。 (一)目的明确练习的目的不是只让学生多見几种类型的題目,而是要根据教学的需要,通过练习,使学生更好地掌握知識并获得解題的技能和技巧。因此在选題时,即使是使用课本上的习題,也要根据具体的目的进行选配,以使学生作一个題就有一个題的收获。根据不同的需要,大致可把练习分为下列几种: 1.理解概念的练习。为了使学生理解概念,往往选择一些比較簡单的題目进行口头练习。例如在讲圓周角的定义“頂点在圓上并且两边都和圓相交的角叫做圓周角”时,为了使学生理解这个定义,使学生就图1中几个图形,判断哪 The “exercise” in mathematics teaching is the only way for students to master knowledge. This is well known. This is because, through practice, not only can students develop application skills and skills, but they can also help them master theoretical knowledge in depth. Therefore, classroom exercises are an indispensable part of the teaching process and must be combined organically. Here’s how to design and properly arrange exercises according to the needs of teaching, and talk about several issues worth noting. (A) The purpose of the purpose of a clear exercise is not only to allow students to see more than a few types of topics, but according to the needs of teaching, through practice, so that students can better grasp the knowledge and skills and skills to solve problems. Therefore, when selecting topics, even using exercises in textbooks, it is necessary to match them according to specific purposes so that students can have a single title for a topic. According to different needs, the practice can be roughly divided into the following types: 1. Understand the concept of practice. In order to make students understand the concept, they often choose some simple topics for oral practice. For example, when we say that the definition of the circle angle is “the vertex is on the circle and the angle where both sides intersect with the circle is called the circle angle”, in order to make students understand this definition, let the students determine several patterns in Figure 1,