一、案例背景符号感是人的一种基本的数学素养,理解符号感,并让学生在数学学习过程中建立符号感,是新课标十分重视的问题。《用字母表示数》是我校一位青年教师在数学校本主题教研活动中上的一节研究课,我听了这节课后,感触很深刻。《用字母表示数》是苏教版小学数学四年级下册第13单元的教学内容,是学生学习代数的入门知识,难点在于学生的认知还停留在由具体的数和运算符 First, the case background Symbolic sense is a basic mathematical quality of people, to understand the sense of symbols, and let students establish a sense of the symbol in mathematics learning process, the new curriculum standard attaches great importance to the issue. The “number of letters” is a research class conducted by a young teacher of our school in the theme of teaching and research in the school of mathematics. After listening to this class, I was deeply touched. “The number of letters” is the teaching content of the thirteenth unit of the fourth grade of the Sujiao version of elementary school mathematics, is the entry-level knowledge of students to learn algebra, the difficulty is that students remain in the cognitive by the specific number and operator