2. Start with the counting of quantity;

3. Pay attention to the relationship between quantity, number and numeral;

4. Adopting three-stage teaching method;

5. Use Arabic mathematics to unify fonts;

6. Pay attention to the concept of 0 and the calculation of decimal coefficient;

7. The operating basis of synthetic decomposition is ten;

8. Different colors represent different bits;

9. The method of error control is to use checking calculation or correction. Montessori believes that "error correction" is one of the scientific principles that make the operation effect of Montessori teaching AIDS perfect. Correcting mistakes is not important in itself. What is important is to let every child realize his mistakes and have ways to test them.

10. Grasp the basic concept of number first, and then integrate;

1 1. There is a fixed process, from simple to difficult to form its own system.