The purpose of this study is to analyze pedagogical content knowledge in mathematics
teaching of secondary special education teachers and implementation of instructional
modification, and to investigate the relationship between them. The results of this study are
as follows.
First, secondary special education teachers showed a level of pedagogical content knowledge
in mathematics teaching above the average and especially, they showed a high level of
knowledge in student understanding.
Second, secondary special education teachers showed a level of instructional modification
performance above the average and there were no significant differences in implementation of
instructional adaptation, according to teachers' places of work, or participation in training.
Third, there was a positive correlation between pedagogical content knowledge in
mathematics teaching of secondary special education teachers and implementation of
instructional modification.
These results imply that first, it is required to secure time for curriculum research, to
provide an environment for teachers to prepare for classes using pedagogical content knowledge
developed by them, and to provide pre-service training and in-service training for special
education teachers, in order to strengthen their pedagogical content knowledge.