Mathematics anxiety involves feelings of tension and stress that interfere with the solving of mathematical problems in academic and daily life situations. To investigate the relative effectiveness of group negative practice and group anxiety management training in reducing mathematics anxiety, 72 math-anxious high school students were divided into one of the two training groups, the placebo treatment group, or the no-treatment group. Results indicated that both treatment groups exhibited significantly less anxiety than the no-treatment control group. The placebo procedure produced treatment effects that were not significantly different from the recognized treatments. There was no significant difference between the treatment and control groups in grades in mathematics. The findings support the hypothesis that the treatments reduce math anxiety and improve performance in math. (Author/JAC)