【设计理念】《数学课程标准》明确提出“:学生的数学学习内容应当是现实的、有意义的、富有挑战性的,要有利于进行主动的观察、实验、猜测与交流。内容的呈现应采用不同的表达方式,以满足多样化的学习需求。作为一种有效的数学学习活动,学生的动手实践、自主探究与合作交流是 【Design Concept】 “Mathematics Curriculum Standards” clearly states: "Students should be realistic, meaningful and challenging to engage in active observation, experiment, speculation and communication. Using different ways of expression to meet diverse learning needs.As an effective mathematics learning activities, students’ hands-on practice, independent inquiry and cooperation and exchange are