В уме is an educational program designed to improve mental calculation skills. It features a collection of math problems from the book "1001 задача для умственного счёта" by S.A. Rachinsky. By working with numbers in your mind, this program aims to positively influence brain development. Whether you're on the go or simply prefer not to use pen and paper, В уме allows you to engage in mental gymnastics.

This iPhone app provides a convenient way to practice mental math skills. It offers a variety of problem types, allowing users to challenge themselves and enhance their numerical abilities. With its historical context and focus on mental calculation, В уме offers a unique approach to educational gaming.