"Knowledge is real knowledge only when it is acquired by the efforts of your intellect, not by memory" Leo Tolstoy

The application is а math brain-twister. The purpose of the application is to accelerate the development of mental calculation skills with basic mathematical operations (addition, subtraction, multiplication and division).
The application develops an understanding of priority of mathematical operations and the purpose of parentheses.

Application features:
● free choice of the level of difficulty (novice, master or expert) without the need to accomplish all levels one after another;
● the interim calculation screen allows you to control the sequence of operations performed; it also prevents you from memorizing false knowledge;
● the table of achievements introduces a game component to the learning process and stimulates for achieving better results;
● the application has simple and intuitive interface.

Despite the seeming simplicity, doing calculations requires mental agility and people of any age will not feel bored with this application.

The application is free of any advertising and in-app purchases.

Sounds for this application are taken from
Licenses: Creative Commons 0 (,
Creative Commons Attribution 3.0 (

P.S. Your feedback is highly appreciated. It will help us to continuously improve the app and include new features.

What’s New

Version 1.3

This app has been updated by Apple to use the latest Apple signing certificate.

● fixed sound volume control
● other minor bug fixes

App Privacy

The developer, Yuri Farafonov, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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