《义务教育数学课程标准》指出,数学课程“不仅要遵循学生学习数学的心理规律,强调从学生已有的生活经验出发……数学学习活动必须建立在学生的认知发展水平和已有的知识经验基础之上。”这就是说,数学教学活动要以学生的发展为本,给学生一片自由的天空。一、激发兴趣,引导学生动机兴趣是入门的向导,是感情的体现,它能促使动机的产生,它是学习动机最现实、最活跃的成分。因此,在上课伊始,要给学生较强的、新颖的刺激,把学生的注意力迅速集中到特定的教学任务和 “Compulsory education mathematics curriculum standards,” pointed out that mathematics curriculum “not only to follow the psychological laws of students learning mathematics, emphasizing the existing life experience of students starting ... ... mathematics learning activities must be based on the level of cognitive development of students and the existing Based on knowledge and experience. ”That is to say, mathematics teaching activities should be based on the development of students, giving students a free sky. First, to stimulate interest and guide students motivation Interest is a guide to start, is the embodiment of feelings, it can promote motivation, it is the most realistic and active learning motivation ingredients. Therefore, at the beginning of class, to give students a strong, novel stimuli, the students’ attention quickly to a specific teaching tasks and