This study aims to explore the relationship between self anxiety, intelligence quotient (IQ), and mathematical reasoning ability in senior high school students. The approach used in this study was a quantitative method with a correlational design, which involved the application of partial regression and multiple regression analysis. The research sample consisted of 31 students selected from two schools in Bandar Lampung, namely SMA Negeri 5 and SMA Negeri 15, which were taken from a population of 56 grade XI students. Data in this study were collected through test and non-test instruments. The analysis showed that self anxiety and Intelligence Quotient contributed 55.9% to students' mathematical reasoning ability, while the remaining 44.1% was influenced by other variables that were not the focus of this study.
                        
                        
                        
                        
                            
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