The author examined the effects of cooperative learning on the achievement in and attitudes toward mathematics of a group of 5th-grade students of color in a culture different from the United States (i.e., Bermuda). Students participated in 12 weeks of R. Slavin's (1978) Student Teams Achievement Division method of cooperative learning in mathematics during the fall semester. Students completed 2 measures: the computation and application sections of the California Achievement Test (1985) Form E (Level 14) and Penelope Peterson's Attitude toward Mathematics Scale for Grades 4-6 Students at 4 different intervals. The measures were completed as pretest at the beginning of the semester (before students were exposed to cooperative learning) and as posttests at the end of Weeks 5, 9, and 13. Data were analyzed with a 1-factor (4 levels) repeated measures analysis of variance design to ascertain whether there were significant differences among the pre-and posttest scores. Results suggest that there were positive gains in attitudes and achievement.