The research focuses on determining the student interns’ perceptions about the 4 core values according to Inprasitha (2013). The participants were 124 student teachers in the mathematics education program, at KhonKaen University during the 2017 school year. Data were collected by questionnaires, interviews after their completion of practicum and participatory observation. Data were analyzed by descriptive statistics and content analysis. The results revealed 100% of student interns perceived each value. The four values are: 1) Building Collaboration: they valued students’ working together and recognized the need to compromise opinions arising from mutual discussions while planning and reflecting together; 2) Open-Minded Attitudes: they valued listening to comments from their peers, and they valued waiting for students to understand the problem/situation by themselves and gave students the opportunity to think by themselves and explain their ideas; 3) Public Concern: they valued supporting student learning in the classroom and taking care of all students, and they could help with school activities and; 4) Emphasis on Product-Processes Approach: they valued thoroughly planning, anticipated students’ ideas and patiently waited for students to solve their own problems.