Skills to quickly add numbers

Use this program to improve your arithmetic memory. This program allows you to develop and improve the skills of compiling numbers in your mind.
At the start of the program, we adjust the parameters: range, number and time interval for the demonstration of one number. The following is a demonstration of the numbers of the given range. The next screen asks for your result and is compared with the correct one. It gives the opportunity to train memory, develop mental and analytical abilities.