六年级上册《圆环面积》一直是学生学习的难点,这节课中,学生要直观认识圆环,推导圆环面积计算公式,并解决生活中的实际问题。以往在教学中,教师通过多媒体的生动使用,大量的经典习题训练,辛苦教学下来,发现学生课堂上会了,下课又不会了;有圆环具体图的会了,实际的生活问题又不会了;单元学习后明白了,毕业复习时又不 Sixth grade volume “ring area” has always been a difficult point for students to learn. In this lesson, students should know the ring visually, deduce the area formula of the ring and solve the practical problems in life. In the past in teaching, teachers through the vivid use of multimedia, a large number of classic exercises training, hard teaching down and found that students will be in class, classes will not be; a ring of concrete plans will be, the actual problem of life and not Will; understand after the unit to learn, graduation review no