Игра "Устный счет" app for iPhone and iPad

The program offers randomly generated arithmetical tasks for for you to solve and verify.

The complexity can be adjusted: turn on and off any of the arithmetic operations (addition, subtraction, multiplication, division), decrease or increase the size of first and second numbers in tasks. During the game, you can make up to four mistakes (you have 4 "lives"), after the fourth mistake the limit of "lives" is being depleted and, accordingly, the game ends. The higher is the difficulty, the more is score reward you get for the correct answer. Application allows you to save your high score achievements.

Compete with your child! Who is the best mental calculator?

Application requires iPhone 8 or above to operate properly.