《数学课程标准(2011年版)》指出:“教学活动是师生积极参与、交往互动、共同发展的过程。”新课程理念下动手实践、自主探索与合作交流等数学学习活动已成为学生学习数学的重要方式。教师在设计活动时,既要考虑其多样性和灵活性,更要考虑其有效性。一、摸一摸,感知抽象的数学概念学生获得正确的数学概念是一个主动的、复杂的思维过程,应提供丰富的感性材料让学生观察,使学生在观察的基础 The Standard of Mathematical Curriculum (2011 Edition) states: “Teaching activities are the process of active participation, interaction and common development between teachers and students.” "Mathematics learning activities such as hands-on practice, independent exploration and cooperation and exchange have become students An important way to learn math. When teachers design activities, they must consider their diversity and flexibility, but also consider their effectiveness. First, touch and feel the abstract concept of mathematics Students get the correct mathematical concept is a proactive, complex thinking process, should provide rich and sensible materials for students to observe, so that students in the basis of observation