The purposes of this study were twofold: 1) to examine the influence of performance expectancy, and effort expectancy on secondary school students attitudes toward the use of a mathematics online homework package called MyiMaths; and 2) to predict the factor that best influences their attitudes. A 15 item, five-point Likert-scale instrument was administered to 345 secondary school students, and data were analyzed using the Partial Least Squares-Structured Equation Modeling (PLS-SEM) approach. Findings revealed that there were significant relationships between performance expectancy, effort expectancy, and student attitude toward the use of an online mathematics homework tool. The findings also indicated a positive relationship between student attitudes and their actual use of online homework. Additionally, performance expectancy was found to be the best factor for predicting student attitude toward the use of online homework. The outcomes of this study will enable educators to design appropriate teaching and learning interventions for their students.