A free program for Android, by StickyApple.com.

40 Seconds Mental Maths Game is a simple mental math game that can be played by people of all ages. The game consists of a series of mathematical questions that can be solved by completing the given arithmetic operations within 40 seconds. Each question is assigned a difficulty level that is determined by the number of operators and the length of the calculation.

If you are not an expert at math, don’t worry, the questions are easy to understand and solve. The game is developed to improve your mental arithmetic, calculation, and addition skills.