数感是一种主动地、自觉地或自动化地理解和运用数的态度与意识。它是建立明确的数概念和有效地进行计算等数学活动的基础,是将数学与现实问题建立联系的桥梁。《数学课程标准(实验稿)》指出:“数感主要表现在:理解数的意义;用多种方法来表示数;能在具体的情 Sense of number is a kind of initiative, consciously or automatically to understand and use the number of attitudes and awareness. It is the basis for establishing a clear concept of numbers and for conducting mathematical activities such as calculations efficiently, as well as a bridge linking mathematics with real issues. ”Mathematical Curriculum Standard (experimental draft)“ pointed out: ”Sense of number mainly in: the significance of understanding the number of ways to represent the number of; in a specific situation