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Hand-eye coordination: When using the "Quick Calculation" app for calculation, users need to use their fingers or stylus to enter numbers and operators on the screen, while maintaining the coordination of fingers and eyes, which helps to improve hand-eye coordination. Reaction speed: Fast calculation requires users to respond in a short time and quickly enter numbers and operators, which helps to exercise reaction speed and accuracy. Attention concentration: When making quick calculations, users need to maintain a high degree of concentration to ensure that the input numbers and operators are correct. This helps to improve the user's attention and concentration. Agile thinking: Fast computing requires users to carry out complex calculations and reasoning in a short period of time, which helps to exercise the user's thinking agility and logical thinking ability.