International College, Suan Sunandha Rajabhat University (SSRUIC) have conducted a workshop under the Project for promoting teachers to create online lessons to improve Thai education since October 2019. Managing safety training during and after the COVID-19 Pandemic, SSRUIC postponed all schedule of on-site workshop. However, there are safe ways to train the junior high school mathematics teachers while staying healthy. Due to social distancing requirement, SSRUIC mathematics specialist team provided the blended online training program for three phases: Phase 1-- starting from designing the lessons that meet online learning requirements following to the instructions from the manuals and resources provided on the website; Phase 2-- introductory and preliminary feedback regarding the Pedagogy, Content, and Knowledge (PCK) given via Facebook Live and Technological Knowledge (TK) given via videoconference; Phase 3-- participants joined the on-site workshops for additional training.