《义务教育数学课程标准(2011年版)》明确指出:“在数学课程中,应当注重发展学生的数感、符号意识……数感主要是指关于数与数量、数量关系、运算结果估计等方面的感悟。建立数感有助于学生理解现实生活中数的意义,理解或表述具体情境中的数量关系。”数感在几个核心概念中排在第一位,可见让学生在数学学习过程中建立数感尤为重要。不久前听了特级教师吴汝萍 “Compulsory Education Mathematics Curriculum Standard (2011 Edition)” clearly states: “In the mathematics curriculum, should pay attention to the development of students sense of the number, symbolic consciousness ... Sense of the number of mainly refers to the number and quantity, the relationship between the number of estimates of the operation results The establishment of a sense of number helps students understand the meaning of numbers in real life and understand or express quantitative relationships in specific contexts. ”Sense of number ranks first in several core concepts, showing that students in mathematics Learning to establish a sense of number is particularly important. Not long ago heard the special grade teacher Wu Ruping