Square Pyramidal Numbers Puzzle Manipulative
Description
The [Square Pyramidal Numbers](Http://En.Wikipedia.Org/Wiki/Square_Pyramidal_Number) Are The Sums Of The First N Squares: 1^2 + 2^2 + ... + N^2 = N (N+1)(2N+1)/6. This Puzzle Illustrates A Nice Geometric Proof Of This Sum Formula. The Original Sum Is Represented By A Step Pyramid Where The (Square) Levels Contain 1^2, 2^2, 3^2, ... , 5^2 Blocks. The Challenge Is To Assemble Six Of These Pyramids Into A 5 X 6 X 11 Box.
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