所谓数感,是指人对数与运算的一般理解,对数与数量、数量关系以及运算结果估计方面的直接感悟,是一种主动、自觉或自动地理解数和运用数的态度和意识。数感的建立能让学生更好地理解现实生活中数的意义, The so-called sense of the number refers to the general understanding of human logarithm and operation, logarithm and quantity, the relationship between quantity and the operation results of the direct perception, is a kind of initiative, consciously or automatically understand the number and the use of the number of attitudes and awareness. The establishment of a sense of number allows students to better understand the meaning of the number of real life,