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教学目标:1.认识圆的周长,能用滚动、绕线等方法测量圆的周长。2.在测量活动中探索发现圆的周长与直径的关系,理解圆周率的意义及圆周长的计算方法。3.能正确地计算圆的周长,能运用圆周长的知识解决一些简单的实际问题。教学过程:一、创设情境,合理猜想1.认识周长公园路线图师:上星期六,叶老师带着侄儿小明到公园玩,来到公园入口处,公园里有圆形和正方形两条路线,我在入口处等,让小明选择一条路线能尽快回到我身边,你们觉得小明会选择哪条路线?为什么?
Teaching Objectives: 1. To understand the circumference of the circle, can use rolling, winding and other methods to measure the circumference of the circle. 2. In the measurement activities to explore the discovery of the relationship between the circumference and the diameter of the circle, to understand the meaning of the circumference of the circle and the calculation of the circumference. 3. Can correctly calculate the circumference of the circle, can use the circumference of the knowledge to solve some simple practical problems. Teaching process: First, the creation of scenarios, reasonable guess 1. Perimeter Park Road map division: Last Saturday, Ye took his nephew Xiao Ming play to the park, came to the park entrance, the park has two circular and square routes , I wait at the entrance, so that Xiao Ming choose a route back to me as soon as possible, do you think Xiao Ming will choose which route? Why?