Symbol is not only the language of mathematics, but also the tool and method of mathematics, that is to say, symbol is not only a mathematical thought, but also a mathematical method.

First, the application of letter symbols in primary school textbooks

1. Use letters to represent numbers.

2 use letter symbols to indicate the operation: a?

3. Use letters to express the algorithm

4 Use letters to express the quantitative relationship.

5. Use letters to express the formula

6. Use letters to express the unit of measurement

7. Use letters to represent points, lines or figures.

Secondly, symbolic consciousness is one of the ten core concepts in curriculum standards. We can understand the symbol consciousness from the following points.

1 Understand the numbers, quantitative relations and changing rules represented by symbols.

Symbols can be used to represent numbers, quantitative relationships and changing laws.

Knowing that symbols can be used for operation and reasoning is an important form of mathematical thinking, and the conclusion is general.

Only when numbers are represented by letters can the equation be expressed concisely and internationally.