在小学数学课堂教学中,学生动手实践越来越引起广大教师的重视,课堂上的操作活动明显多了起来。但是,教师对活动的设计往往不够深入,缺乏探索性。笔者在教研活动中听了几位教师上的《圆锥的体积》一课,他们在探索圆锥体的体积时,都安排了动手操作活动。学生虽然都通过操作得出了计算圆锥体的体积公式,但是,操作活动的深度却有很大差异,教学效果自然也差别很大。 In primary school mathematics classroom teaching, students practice more and more attracted the attention of the majority of teachers, the operation of the classroom obviously more. However, the teacher’s design of activities is often not deep enough, the lack of exploration. In the teaching and research activities, I listened to a few teachers on the “cone volume” lesson, they explored the volume of the cone, they arranged hands-on activities. Although the students have come to calculate the volume of the cone formula, but the depth of the operating activities are very different, the teaching effect is naturally very different.