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Improve your ability of oral arithmetic, memory and logical thinking; Fun, fun and can improve themselves, genius must play games! The title will include: => 1-5 digit addition and subtraction => 1-3 digit multiplication and division => Add and subtract => Mixing multiplication and division => Mixed operations of addition, subtraction, multiplication and division => Decimal arithmetic => Negative operation Contact us: Feedback: yang2686022430@163.com Support customized topics: For example, first-year oral math problems, second-year oral math problems, or more difficult problems. If you need to customize, please email.