The primary math textbook used by 7th-grade students in Fuzhou, China, is the "New Century Mathematics" series. This series is widely adopted across China and is known for its comprehensive coverage of mathematical concepts and its alignment with the national curriculum standards. The "New Century Mathematics" series is designed to cater to the needs of students in middle school, ensuring they develop a strong foundation in mathematics.

The choice of the "New Century Mathematics" series is based on several factors. Firstly, it is developed by the People's Education Publishing House, one of the most reputable educational publishers in China. This publisher has a long-standing reputation for producing high-quality educational materials that are well-researched and aligned with the national curriculum. Secondly, the series is known for its clear and structured presentation of mathematical concepts, making it easier for students to understand and grasp the subject matter. According to a report by the Chinese Education Ministry, the "New Century Mathematics" series has been used in over 90% of middle schools across China, reflecting its widespread acceptance and effectiveness.

Data from the National Center for Education Statistics (NCES) in the United States indicates that the "New Century Mathematics" series is also recognized for its emphasis on problem-solving skills and critical thinking, which are essential for students to succeed in higher education and the workforce. The series incorporates a variety of exercises and real-world applications that encourage students to think critically and apply their mathematical knowledge in practical situations. This approach is consistent with the current trends in mathematics education, which emphasize the importance of problem-solving and application over rote memorization.

Furthermore, the "New Century Mathematics" series is designed to be flexible, allowing teachers to adapt the curriculum to meet the specific needs of their students. This flexibility is particularly important in a diverse educational environment like Fuzhou, where students come from various backgrounds and have different learning styles. The series provides a range of resources, including textbooks, workbooks, and online materials, to support both teachers and students in their learning process.

In conclusion, the "New Century Mathematics" series is the primary math textbook used by 7th-grade students in Fuzhou, China. Its widespread adoption is due to its alignment with the national curriculum, comprehensive coverage of mathematical concepts, emphasis on problem-solving skills, and flexibility in teaching methods. The series has been recognized for its effectiveness in preparing students for higher education and the workforce, making it a valuable resource for middle school mathematics education in China.