The study aimed to determine the achievement level of the students in the four experimental groups based on the pre-test and post-test results along knowledge, comprehension, application and analysis skills; the effect of the methods of teaching towards students’ achievement in mathematics; and the interaction of the students’ achievement scores as influenced by methods of teaching and mental ability. The subjects of this study were the first year students enrolled in the Bachelor of Science in Business Administration of Surigao del Sur Polytechnic State College, Tandag Campus who had taken Basic Mathematics. Constructivist and lecture methods of teaching showed comparable performances during the posttest. Cooperative learning method and reporting method of teaching had exhibited significant difference while the other methods of teaching showed no significant difference. The methods of teaching had greatly influenced the performance of the students. The methods of teaching and mental ability had interacted with each other which resulted to the high performance level of the students.