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数感是人的一种基本素养,是人主动自觉地理解和应用数的态度和意识,是学生认知数学对象进而成为数学气质的心智技能,是学习数学的重要结构变量。《数学课程标准》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,在“数学思考”中具体提出数感表现在:理解数的意义,能用多种方法来表示数,能在具体的情境中把握数的相对大小关系,能用数来表达和交流信息,能为解决问题而选择适当的算法,能估计运算的结果,并对结果的合理
Sense of the number of people is a kind of basic literacy, is the attitude and awareness of the people to consciously understand and apply the number of students is the mathematical skills of cognitive math and then become mathematical skills, is an important structural variables in learning mathematics. Mathematical Curriculum Standard states that the sense of number refers to the sentiment about the number and quantity, the relation of quantity and the estimation of the result of the operation. The number sense is specifically put forward in “Mathematical Thinking”: the significance of understanding number, A variety of ways to represent the number of cases in a specific situation to grasp the relative size of the relationship between the number can be used to express and exchange information can solve the problem and choose the appropriate algorithm to evaluate the results of the operation and the results of reasonable