我们常听到老师抱怨学生没有数感,抱怨学生在使用计量单位时的错误。其实数感是学生对数敏感性的一种直觉,是对数学概念的直接反映,是学生建立明确的知识概念和运用知识解决问题的桥梁。它不是本来就有的本能,也不是教师教出来的,而是学生自己的体验和感悟。下面笔者就《毫升与升的认识》的几个教学片断进行剖析,谈谈如何在实际教学中培养学生的数感。 We often hear teachers complain that students have no sense of number and complain about the mistakes students make when using units of measurement. In fact, the sense of number is an instinct of logarithmic sensitivity, which is a direct reflection of the concept of mathematics. It is a bridge for students to establish a clear concept of knowledge and use knowledge to solve the problem. It is not inherent instinct, nor is it taught by teachers, but the students own experience and perception. The following author on the “milliseconds and the rise of awareness,” a few pieces of teaching analysis, talk about how to develop a sense of the number of students in the actual teaching.