mental arithmetic training - B (bnb.MentalArithmetic.training) on Google Play

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Please wake up your brain!When the mental arithmetic is a useful application that can be used.You can adjust the difficulty level.------------------------- ----------------------- Notes ---1. You can choose the operator. (+), (-), (+ - *)2. You can set the scope of the study.3. You can set the number of operators. (1 + 2), (1 + 2 + 3)