Mental arithmetic, also called "oral arithmetic", is one of the teaching methods of mathematics. A calculation method based on thinking and language activities without any tools. It can cultivate students' quick calculation ability and develop their attention, memory and thinking ability.

Proficiency in verbal calculation is helpful for written calculation and is convenient for daily use. Fast center is the only way to perform simple operations without any physical objects, abacus, fingers, chessboard and charts.

Effect:

The arrangement and difficulty of the textbook "Fast Mental Arithmetic" is a fast calculation that closely follows the syllabus of primary school mathematics and integrates with junior high school algebra, which is simpler than the primary school textbook. Simplify written calculation and strengthen oral calculation. It is simple, easy to learn and interesting. After a short period of training, primary school students can write answers directly by adding, subtracting, multiplying and dividing, not vertically.