In Somaliland mathematics is performed poorly in secondary schools. In 2010-2014, the mean score of mathematics was 53.95% against 73.72% in Languages, 68.68% in Sciences, and 83.16% in S/Studies. But the influence of personal characteristics of the teacher had not been investigated. Guided by Trait Theory of Personality, the study used a cross sectional research design, on a stratified sample of 350 students and 16 teachers in 10 secondary schools in Borama District, in February of 2014. The study found teacher gender (t 14] = -.276, p = .785), and teacher qualification (F 1, 14] = .578, p...