# Shi Fengshou Rapid Calculation

**Shi Fengshou** is a mental calculation system developed by Prof. Shi Fengshou.^{[1]}

The basic features of Shi Fengshou Rapid Calculation are as follows:

- Begins from the higher digits, proceed from left to right.
- Employs no calculation devices.
- Follows no fixed procedure.
- Provides the correct answer directly upon seeing the problem.
- Can be applied to problems involving addition, subtraction, multiplication, division, roots, trigonometric functions, logarithms, and so forth.