苏霍姆林斯基说:“教给学生能借助已有的知识去获取知识,这是最高的教学技巧之所在。”从心理学来分析,无恐惧心理,学生容易活跃;无畏难情绪,易于启发思维;旧知识记忆好,容易受鼓舞;从日常现象入手,会轻易克服畏难情绪;小学数学中的有些概念,往往难以直观表述。如比例尺、循环小数等,但它们与旧知识都有内在联系。我就充分运用旧知识或日常现象 Suhomlinski said: “Teach students to use existing knowledge to acquire knowledge, which is the highest teaching skills. ” From the psychological analysis, no fear, students are easy to active; fearless Emotions, easy to inspire thinking; good memory of old knowledge, easy to be encouraged; from the beginning of everyday phenomena, will easily overcome the fear of emotion; some concepts in elementary mathematics are often difficult to express visually. Such as scale, rounding decimal, etc., but they are all inherently related to old knowledge. I make full use of the old knowledge or everyday phenomenon