This OSF project hosts the supplementary data and materials accompanying the Classroom Note "Useful Misconceptions" by Gestiardi, Subanji, and Yulanda (Doctoral Program in Basic Education, Postgraduate School, Universitas Negeri Malang). The note reframes four classroom items often dismissed as mathematical "traps" — fraction division (1/2 ÷ 1/4), the classification of quadrilaterals (is a square a rectangle?), multiplication by decimals less than one (10 vs. 10 × 0.1), and the order of operations (6 ÷ 2(1 + 2)) — as useful diagnostic tools for primary mathematics teaching. The repository contains: - Aggregate pre/post results (Table 1) from a two-hour workshop held in April 2026 with twelve in-service primary teachers from four primary schools in East Nusa Tenggara, Indonesia. - The coding scheme used to classify teacher responses on Item 2.1 (meaning-based vs. procedural) and Item 2.2 (inclusive vs. partition classification, following de Villiers, 1994). - Workshop documentation: event description, administration protocol for the pre/post written format, and the ethical statement. - A transcript guide indexing three workshop recordings — an individual interview covering the Item 2.2 diagnostic exchange, a school exploration discussion providing local context, and a group workshop in which the Item 2.1 diagnostic and the watermelon illustration were administered live. Scope and limitations: Individual-level paper response sheets were not digitised; only aggregate totals are available in machine-readable form. All teachers participated voluntarily, gave informed consent, and were assured that the reported results would contain no identifying information. Location, school names, and participant identifiers have been anonymised in all files. These materials are shared to support replication, classroom adaptation, and follow-up research on misconception-based mathematics teaching in primary education. Citation of the accompanying Classroom Note is requested for any reuse.
Rivan Gestiardi (Thu,) studied this question.