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- Summary: Maths Operator is a fun educational game which tests: 1. your speed of doing addition and subtraction. 2. your reaction time of tapping all correct answer pairs 3. your reaction time towards a question including both positive and negative number (Note that negative number occurs only in Pro version)During the game, the faster you calculate the correct answers, the higher the score you can get and the level you can reach. Therefore, this app also helps you and/or your kids in practicing speedy calculation accuracy. The game is very simple. A question will be presented each time. You have to tap all the correct answer pairs within a certain time limit. Note that all the numbers shown on the screen can be paired up. The longer you can persist, the higher will be the difficulty. Hence, the game is addictive and challenging, especially, when you would like to get a high score and compete with all other players in the world. Hope that all of you enjoy it, and can get improvements in maths knowledge. Maths does not have country border nor age border. You may not be able to beat a kid! Check out your ranking in Leaderboard!Our Maths Game Series:Maths Factor (Factor, Multiply, Prime number, Composite number):http://itunes.apple.com/app/maths-factor/id533360695?ls=1&mt=8Maths Operator (Addition, Subtraction, Positive number, Negative number): http://itunes.apple.com/app/maths-operator/id541414031?ls=1&mt=8… Expand