1. Mastering basic arithmetic rules: Being familiar with basic arithmetic rules such as addition, subtraction, multiplication and division is the basis of fast calculation.

2. Practice oral calculation skills: You can improve your calculation speed and accuracy through a lot of oral calculation exercises. You can try to use different oral calculation methods, such as vertical calculation, approximate calculation or adjusting the calculation order.

3. Use mental arithmetic skills: master some mental arithmetic skills, such as the distribution law of multiplication and the shorthand method of square numbers, and you can quickly apply these skills to calculate when necessary.

4. Avoid redundant operations: When doing mental arithmetic, try to avoid unnecessary operations and repeated calculations. If mistakes are found in the previous steps, correct them in time.

5. Training memory: Improving mental arithmetic speed requires good memory. You can help remember and calculate by memorizing some common number combinations, laws or formulas.

6. Stay focused and focused: When doing mental arithmetic, try to stay focused and focused to avoid distractions and interference. This is helpful to improve the calculation speed and accuracy.

7. Practice actual combat drills: Through a large number of actual combat drills, such as doing some math problems or participating in math competitions, you can exercise your mental arithmetic ability in actual situations and gradually improve your speed.

It should be noted that although mental arithmetic can improve the calculation speed in some cases, for some complex problems or situations that require accurate calculation, it is still necessary to use pen arithmetic or electronic equipment for calculation.