【教学内容】人教版教材六年级上册第62~63页。【教学目标】1.通过设计研究方案、实施研究方案等过程,帮助学生理解圆周率的意义,并自主发现、总结求圆周长的计算方法。2.让学生经历探究发现圆周率的过程,培养学生探究的能力和解决简单的实际问题的能力。3.培养学生勇于探索、积极思考、团结协作的良好行为习惯,让学生在学习中体验数学的价值。【课前思考】“圆的周长”是一节经典老课。但以“数学基本活动经验积累”为背景的实践与研究 【Teaching content】 PEP sixth grade materials on the first 62 ~ 63 pages. 【Teaching Objectives】 1. Through the design of research programs, the implementation of research programs and other processes to help students understand the meaning of the PI, and to discover, summarize the method of calculating the circumference. 2. Have students go through the process of exploring the discovery of pi, developing their ability to explore and their ability to solve simple, practical problems. 3. Students brave to explore, positive thinking, good behavior of unity and cooperation so that students experience the value of learning mathematics. [Thinking before class] “Circle perimeter ” is a classic old class. However, the practice and research based on the accumulation of experience in basic activities of mathematics