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Demonstrations 1 - 20 of 265
Addition and Subtraction on a Circular Ruler
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Nets of Polyhedra
Equations with Fractions
Addition and Subtraction of One-Decimal Numbers Using Rulers
Division by Successive Subtraction
Magic Zero Hexagons
Bad Fraction Simplification
How Old Would You Be on Another Planet (or Pluto)?
Tri: A Variant of Hex Played on a Sphere
Percentages are Reversible
Magic Squares and Designs
Testing Reading Comprehension
An Octopus under Water
Square with Lines and Points
Mrs. Perkins's Quilts
Rule of Product Applied to Decks of Cards
Ten Year Calendar
Toy Car Transformer
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