Many factors contribute to the success of students' academic performance. Admittedly, quality of teaching is one of those factors. In this study, based on the related literature on teacher motivation, six main factors affecting teachers' motivation towards teaching are identified. Accordingly, an online questionnaire was designed by the authors. In total, 207 (40 males and 167 females) mathematics teachers from primary, secondary and sixth-form government schools in Brunei Darussalam randomly volunteered to respond to this questionnaire. The findings from this study have implications for understanding the extent to which factors may motivate or demotivate teachers to teach. The present research provided education stakeholders with important information to ponder over the motivational factors of mathematics teachers in the government schools. The results from our study also suggested that good interaction and collaboration between teachers can help boost teachers' motivation to teach.