Through KenKen puzzles, students can explore parity, counting, subsets, and various problem-solving strategies.
Harold B. Reiter, John Thornton, and G. Patrick Vennebush
Gloriana González and Anna F. DeJarnette
An open-ended problem about a circle illustrates how problem-based instruction can enable students to develop reasoning and sense-making skills.
Matt B. Roscoe
Having prospective teachers find the inscribed angle theorem for themselves can foster mathematical reasoning.