The rooms of the Working Group Mathematics Education (Secondary Levels) are located on the first floor of building I on campus Landau. The exact location is also marked on Google maps.
Several bus lines run between the central bus station at Landau Hauptbahnhof and the stops Uni/Messeplatz or Zoo (Abzw. Uni).
At this website you can search for bus connections using an electronic timetable information system. Enter Landau, Universität as the destination.
Bus line 537 connects all university locations in Landau with each other and with all train stations:
Directions to the Campus Landau
Directions to Campus Landau of the RPTU can be found here.