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This study examined the mediating roles of mathematics anxiety and learning interest between problematic smartphone use and mathematics achievement. After two-stage stratified sampling, 30,601 Chinese fourth-graders participated by completing a paper-based test on mathematics achievement and an online questionnaire that included questions on demographic information as well as the problematic smartphone use, mathematics anxiety, and mathematics learning interest scales. The results showed that (1) smartphone use was more problematic among boys than among girls, and students with a low SES tended to be more problematic smartphone users, (2) problematic smartphone use was negatively correlated with mathematics achievement, (3) mathematics anxiety and learning interest partially mediated the relationship between problematic smartphone use and mathematics achievement, and (4) the relationship between problematic smartphone use and mathematics achievement was serially mediated by mathematics anxiety and then mathematics learning interest. The implications of this study and suggestions for future research are discussed. • This study examines the relation between PSU by pupils and math achievement. • The mediating roles of math anxiety and learning interest are also investigated. • PSU was negatively correlated with mathematics achievement. • Math anxiety and learning interest played partially mediating roles respectively. • Math anxiety and then learning interest also played serially mediating roles. [ABSTRACT FROM AUTHOR]