《义务教育数学课程标准(实验稿)》将实践活动作为数学学习的一个重要组成部分。其要求是:数学教学活动必须建立在学生的认知发展水平和已有知识经验基础之上,教师向学生提供充分从事学习活动的机会,帮助他们在自主探索和合作交流的过程中真正理解和掌握基本的数学知识和技能、数学思想和方法,获得广泛的数学活动经验。因此,教学时,我们应结合学生的实际经验和已有知识设计富有情趣和意义的活动,使他们有更多的机 The compulsory education mathematics curriculum standard (experimental draft) takes practice as an important part of maths learning. The requirement is that mathematics teaching activities must be based on the students’ level of cognitive development and existing knowledge and experience. Teachers should provide students with opportunities to fully engage in learning activities so as to help them truly understand and cooperate in their own exploration and cooperation. Master basic mathematical knowledge and skills, mathematical ideas and methods, gaining extensive experience in math activities. Therefore, when teaching, we should combine the practical experience of the students and the existing knowledge to design interesting and meaningful activities so that they have more machines