《数学课程标准》明确要求:“教师在教学中要培养学生良好的数感”。数感,狭义指学生对数的感觉,对数的感性,广义讲是对数值的一种直觉,对数的近似值的一种估计。学生数感的培养和建立并非一蹴而就,是在学习过程中逐步体验和建立起来 “Mathematics Curriculum Standards” clearly requires: “Teachers in teaching students to develop a good sense of the number.” Sense of a few, narrow sense refers to the sense of the number of students, the sensibility of the logarithm, speaking broadly speaking is an intuitive, logarithmic approximation of an estimate. The cultivation and establishment of students’ sense of numbers is not accomplished in a single step and is gradually experienced and established during the learning process