TY - CPAPER TI - SCAFFOLDING STUDENTS' COLLABORATIVE PROBLEM-SOLVING ACTIVITIES IN AN ADVANCED UPPER SECONDARY MATHEMATICS CLASSROOM AU - Selling, Alexander Jonas Viktor AU - Nortvedt, Guri A. T2 - Proceedings of the International Group for the Psychology of Mathematics Education, Volume 1 PB - Psychology of Mathematics Education (PME) PY - 2026 SP - 1331 EP - 1338 SN - 2790-3648 KW - Scaffolding KW - Problem solving KW - Thinking classrooms KW - Video observation KW - Collaborative problem solving UR - https://www.igpme.org/publications/RR_PME49/rr/PME49_RR_512_Selling_A/ ER -