Through KenKen puzzles, students can explore parity, counting, subsets, and various problem-solving strategies.
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Using KenKen to Build Reasoning Skills
Harold B. Reiter, John Thornton, and G. Patrick Vennebush
Proofs without Words: A Visual Application of Reasoning and Proof
Carol J. Bell
Reasoning and Proof is one of the process standards set forth in NCTM's principles and standards for school mathematics (2000).