I developed this application for you so that everyone can develop their brain just by taking 15 minutes of their time that they spend at the computer. It is easy and productive. Check it out! Test your memory and mental arithmetic. 2 in 1! Try and develop!
This is a technique developed on the basis of oral arithmetic calculations and allows you to develop the maximum speed of perception and processing of information. The purpose of the programs is the harmonious development of both cerebral hemispheres.