Good knowledge and skill in teaching as well as the teachers’ positive attitude toward curriculum are determined in the achievement of curriculum. The research is a qualitative research which aims to describe knowledge, skill, and attitude of mathematics teachers in implementing 2013 curriculum based on the teachers working period. The instrument of the research was the teacher herself as the main instrument and the supportive instruments were knowledge test, observation sheet, attitude assessment questionnaire, and interview. The data collection was conducted by giving knowledge test to examine the teachers’ knowledge in implementing 2013 curriculum, observation to observe the teachers’ skill in learning process, attitude questionnaire to examine the teachers’ attitude toward the implementation of 2013 curriculum. The subjects of the research were mathematics teachers who had implemented 2013 curriculum which consisted of 2 teachers with 5 years working period and 20 years working period from 2 different schools in Public Junior High Schools in Bulukumba District. The process of the research was conducted by visiting the two schools and giving the knowledge test, conducting learning process observation, and giving attitude questionnaire, as well as interviewing the two subjects; then, conducting data reduction, and formulating the conclusion from the result of the research. The result of the research reveals that the teachers’ knowledge between novice teachers and experienced teachers is almost the same. The novice teachers are prominent in the knowledge about learning models, while the experienced teachers are prominent in the knowledge about the objective of the implementation of 2013 curriculum, the connection between standard criteria of graduates, main competence, basic competence and indicator, scientific approach and authentic assessment. In the aspect of the skill in implementing 2013 curriculum and the implementation of authentic assessment in learning process, the novice teachers have yet to implement the learning process and authentic assessment well, while the experienced teachers have already implemented it well. In the aspect of attitude, both the novice and experienced teachers have positive attitudes toward the implementation of 2013 curriculum and the implementation of scientific approach, but yet  to have positive attitude toward the implementation of authentic assessment