This is an application to help you improve your arithmetic ability quickly. You can add some difficult numbers and arithmetic types to yourself to practice your arithmetic ability. In each exercise, different arithmetic equations will be randomly generated according to the number you choose. You need to choose different numbers and equations to form a new arithmetic equation and calculate the correct answer. After each correct answer, a new arithmetic equation will be generated automatically, and new calculation will be carried out until the answer is wrong. At the end of the exercise, your highest score in history will be counted, and you can use this information to help you analyze which aspects of the exercise need to be strengthened.