A clean and structured reference sheet for students that summarizes the formulas, visual models, and mathematical connections between triangular and square numbers.

A comprehensive facilitation guide for teachers leading the Shape Shifter inquiry. Includes pacing, key questioning strategies, common misconception alerts, and a quick-reference answer key for triangular and square number patterns.

A compact exit ticket for assessing student understanding of triangular numbers, their geometric formulas, and their structural relationship to square numbers.

An instructional slide deck for the Shape Shifter inquiry lesson. It features minimalist visual proofs for triangular and square numbers, emphasizing student notice-and-wonder and the geometric derivation of algebraic formulas.

A visual logic organizer that guides students through the discovery of square numbers and their relationship to triangular numbers. It features sections for sketching visual proofs and formalizing mathematical connections.