This document summarizes a study that investigated the relationships between mathematics attitude, academic motivation, intelligence quotient, and mathematics achievement. The study involved 1670 high school students in Iran. It found that mathematics attitude, academic motivation, and intelligence quotient were all positively correlated with mathematics achievement. A multiple regression analysis determined that mathematics attitude and intelligence quotient significantly predicted mathematics achievement, but academic motivation was not a significant predictor when the other variables were accounted for. The study also found that while there were no significant gender differences in the other variables, males scored higher than females in mathematics achievement.