“数感”是指学生在实际情境中对数的概念和运算要领的体悟和理解,以及运用这些知识的意识。它主要表现在: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,并对结果的合理性作出解释。所以,在数学教学中,我们要讲究方法。努力培养学生的数感。一、在具体情境活动中建立数感《数学课程标准》指出,要引导学生联系自己身边具体、 “Sense of number ” refers to students in the actual situation logarithm of the concept and operation essentials comprehension and understanding, as well as the use of these knowledge awareness. It is mainly manifested in: to understand the meaning of numbers, can use a variety of ways to represent the number of specific situations can grasp the relative size of the relationship between the number can be used to express and exchange information, to solve the problem and choose the appropriate algorithm , Can estimate the result of the operation, and explain the rationality of the result. So, in mathematics teaching, we should pay attention to the method. Efforts to develop a sense of the number of students. First, the establishment of a sense of number in specific context activities “Mathematical Curriculum Standards” pointed out that to guide students to contact their own specific,