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Demonstrations 1 - 20 of 979
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Replay 10 Great Chess Games
Addition and Subtraction on a Circular Ruler
Nets of Polyhedra
Space Visualization Test on Pyramid Edges
Equations with Fractions
Addition and Subtraction of One-Decimal Numbers Using Rulers
Division by Successive Subtraction
Is This Number a Prime?
Magic Zero Hexagons
Length, Width, and Height of an Impossible Object
Mondrian Art Problem
Bicycle or Unicycle Tracks?
Bad Fraction Simplification
How Old Would You Be on Another Planet (or Pluto)?
Tri: A Variant of Hex Played on a Sphere
Circle of Lamps
Percentages are Reversible
Magic Squares from Latin Squares
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