Numerous experiments have proved that the constant use of calculators, even for simple calculations, significantly reduces the productivity of the human brain. There is nothing strange in this, without constant training, any organ of the human body becomes decrepit and atrophies.

Regular calculations in the mind are able to maintain brain performance at any age. This application allows you to solve mental tasks anytime, anywhere.

All tasks are based on simple arithmetic operations and are feasible even for elementary school students.