《数学课程标准》指出,数感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;能估计运算的结果,并对结果的合理性作出解释。需要 Mathematical Curriculum Standard states that the sense of number is mainly manifested in the meaning of understanding the number; the number of ways can be used to represent the number; the relative size of the number can be grasped in a specific situation; the number can be used to express and exchange information; The result of the operation, and explain the rationality of the result. need