Abstract: The primary objective of the study is to design a contextualized learning material in developing the conceptual understanding of Grade 7 students in Mathematics as a teacher support material in mastering the math concept “sets”. The study is considered developmental and quasi-experimental or one group pre-test and posttest since it underwent three phases namely: planning, development, validation, and utilization. In the planning stage, the least learned skill (LLS) was identified based on the item analysis of the first grading quarterly test.