It is worth recommending. The Upgrade Card of Junior High School Mathematics Operation published by Tianjin Publishing House is a set of practice and training tools for junior high school mathematics students. Mainly used to strengthen and cultivate students' basic computing ability. This set of cards includes four operations, such as addition, subtraction, multiplication and division, and 800 exercises, covering integer confusion, decimals, fractions, percentages and other knowledge points. Full coverage. It covers all the knowledge points and basic operations commonly used in junior high school mathematics, including addition, subtraction, multiplication and division, integer fraction percentage and so on. It is comprehensive and comprehensive. Block according to knowledge points. Each card focuses on a knowledge point or a certain type of question, which is convenient for the training and consolidation of the same knowledge point. For example, there are special cards such as "integer", "decimal" and "fraction". Conduct targeted training in all aspects. Graded by difficulty. The difficulty of the topic is reasonable, and it gradually rises from the basic topic. It is easier to gradually luego at the beginning, and gradually cultivate students' ability to adapt to different difficulties. Practical and effective. All topics are very practical and commonly used, involving all aspects of life and study, not limited to theoretical knowledge. It has strong practical value. Quickly correct feedback. As a card job, it is easy to correct. Teachers can give feedback and correct in time, help students correct mistakes and deficiencies in time, and adjust learning strategies appropriately, which effectively promotes learning efficiency and effectiveness. The upgrade card of junior high school mathematics operation published by Tianjin Publishing House is very sound and practical. Comprehensive and systematic coverage of common sense and basic exercises. At the same time, it is graded according to knowledge points and difficulty, which is more targeted.