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One of the causes student’s misconceptions comes from the teacher's misconceptions. It is necessary to study the teacher's misconceptions and conduct treatment to overcome these misconceptions. This study aims to analyze increasing teacher’s PCK related to students' misconceptions on algebraic expression through short training and also to find out the causes of teachers experiencing misconceptions. This type of research is a mixed method. Participants in the study were 54 mathematics teachers who teach in junior high schools in one of the districts in Aceh province. The instrument was a test (pre-test dan post-test) and interview guidelines. Data were analyzed using t test and qualitatively. The results showed that there was an increase in teacher PCK after short training. The cause of teacher misconceptions is generally due to teachers repeating the same misconceptions even though training has been carried out to correct them. In fact, it is not easy to change the mindset of teachers' misconceptions in just one days of training.

PCK, Misconception, teacher, training