Mathematical coding

1, get a preliminary understanding of the structure and meaning of postal codes and the meaning of local postal codes.

2. Understand the meaning of ID code.

The penultimate digit of the ID card is used to distinguish between the sexes, with the singular number representing men and the even number representing women. For example: 440682 * * * * * * means:1983165438+1female born on October 27th.

3. According to the knowledge learned, the student number will be numbered.

Postal code usage

Postal code is a scheme to realize automatic sorting of letters, because computers can't recognize Chinese, but they can recognize numbers. By coding each area, you can quickly sort it by computer. Of course, the finer you write, the better.

Postal code structure

China postal code adopts four-level six-digit coding structure. The first two figures represent provinces (cities, autonomous regions); The third digit indicates the postal area; The fourth digit indicates the county (city); The last two digits indicate the office.