Square Pyramidal Numbers Puzzle Manipulative

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The rectangular numbers form a square sequence: 1 + 4 + ... + n^2 = n(n+1)(2n+1)/6. The step pyramid, with square levels containing 1^2, 3^2, 5^2 blocks, needs to be constructed into six distinct structures, resembling a 5 x 6 x 11 box. Instructions are printed below: Build the puzzle by assembling the provided file onto cardboard pieces; ensure accuracy to size the pieces precisely to form a 5x6 rectangle.