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数感就是认识客观事物与数时建立起来的一种意识,是人对“数”的敏锐、精确、丰富的感知和领悟。学生具有“数感”的最典型特征就是他们能对所遇到的数字模型和计算过程做出直观的归纳,并能把新旧知识建立联系。《义务教育数学课程标准(2011年版)》指出:“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。”显而易见,
Sense of number is to recognize the objective things and the number of times to establish a sense of people on the “number” of sharp, precise, rich perception and comprehension. The most characteristic feature of students who have a sense of number is that they can make an intuitive summary of the numerical models and computations they encounter and can relate new and old knowledge. “Compulsory Education Mathematics Curriculum Standard (2011 Edition)” pointed out: “Sense of the number of mainly refers to the number and quantity, the relationship between quantity, the calculation of the results of estimation, etc. The establishment of a sense of number helps students understand the meaning of real-life number , Understand or express the relationship between the number of specific situations. ”" Obviously,