It alone contributed about 33% of the total variance of the Test 1 score. When the GEFT score was taken into account, it contributed another 10% of the total variance. The third predictor was ethnicity which contributed another 7% of the total variance. Thus, in total 49% of the variance in the Test 1 score is accounted for by basic mathematical skills, GEFT score, and ethnicity of the students. Language skills and gender do not seem to contribute much in solving operational problems in mathematics.