数学新课程标准中明确指出:“有效的数学学习活动不能单纯的依赖模仿与记忆,动手实践、自主探索、合作交流是学习数学的重要方式。”为此,不断丰富小学数学的教学形式.挖掘渗透数学思想的探究活动.使学生在自主探究中获得直接的经验.并在实践中培养应用数学的能力是我们新时代数学教师所值得研究的课题。以下是笔者在教学《圆的周长》这一课时的探究活动设计。我们知道.圆是一种曲线图形,围成圆的曲线的长.就是圆的周长。怎样才能知道圆周长是多长呢?通常情况下,要知道长度需要用直尺量。但是,直尺对于圆周无法直接依靠不动地量出它的长度。因为圆周紧挨着直尺延展的点.在不断地转换着方 The new mathematics curriculum standard clearly states: “Effective mathematics learning activities can not simply rely on imitation and memory, practice, independent exploration, and cooperation and exchange are important ways to learn mathematics.” “To this end, we have enriched the teaching methods of primary mathematics It is worthwhile to study mathematics teachers in our new era to explore the exploratory activity of penetrating mathematics to enable students to gain direct experience in autonomous inquiry and to cultivate the ability of applying mathematics in practice. The following is the author in the teaching of ”Circumference" this lesson design activities of inquiry. We know that a circle is a graph of curves, the length of a circle that encloses a circle, the circumference of a circle. How to know how long the circumference of the circle? Under normal circumstances, to know the length need to use ruler. However, the ruler can not measure its length directly on the circumference. Because the circumference of the ruler extends directly next to the point