This primer summarizes interdisciplinary collaborative mathematics as an integrative approach to train pre-service elementary teachers to teach math utilizing Junior Achievement USA (JA) educational programs within an elementary Math Methods course. The primer provides a JA historical background/program overview, summarizes the interdisciplinary collaborative mathematics approach, outlines an interdisciplinary collaborative mathematics implementation work-plan, and concludes with the relevance of an interdisciplinary collaborative mathematics approach for pre-service elementary teacher training.