This case study was conducted in Maasin, Iloilo, the Philippines, to ascertain the weavers’ way of life, particularly the mathematical concepts embodied in their weaving practices. This study documented mathematics concepts and competencies included in the K to 12 Mathematics curriculum the weavers exhibited. A holistic multiple case study design with a single unit of analysis was employed in this study. Participant observations and in-depth interviews were used with the three purposively chosen informants. The researcher utilized field notes, observation guides, recorded videos, photographs, and artifacts for triangulation and analysis. The mathematics concepts revealed from the weavers are basic arithmetic, estimation, dimension, perimeter and circumference, patterns, congruence, parallelism, perpendicularity, geometric figures, and polygons. The weavers manifest mathematical content standards on key concepts and skills involving numbers, Four Fundamental Operations, Non-standard and standard measures of length and mass, the idea of perimeter and circumference, the concept of measurement, continuous patterns, lines, and symmetrical designs, parallel and perpendicular lines, and quadrilaterals, and polygons, circles, and solid figures. Recommendations on embedding weaving activities in mathematics instruction were discussed.

Keywords : Mathematics Education, Mathematics concepts, case study, Ilonggo weavers, bamboo crafts.