GeoSlice
Slice shapes into pieces, rearrange them, and discover what new shapes emerge. A geometric playground for dissections.
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FractionSlice
Build fractions by slicing segments into even pieces. A playground for fraction investigations.
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Color Calculator
View fractions in their decimal form with each digit represented by a unique color. A microworld from Nathalie Sinclair.
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Double Number Line
A double number line model for visualizing problems like 5⁄6(120).
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Balance Bars
Solve for x in a visual way by keeping the heights of two bars equal.
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Circle Inversion
A visual playground for exploring one of geometry's most surprising transformations.
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Hidden Shapes
With only their vertices visible, can you uncover the shapes hiding in a sea of points?
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Herding Sheep
Use your knowledge of special quadrilaterals to help sheepdogs herd their sheep.
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Hinged Dissections
Explore these magical hinged dissections from Greg N. Frederickson.
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The Odometer
Give this unique odometer a spin as you use your knowledge of place value to reach numerical targets.
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Arranging Addends
The elegant properties of the powers of 2 and 3 allow you to form a multitude of sums with just a handful of addends.
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Open the Safe
The numbered lights on a safe switch on and off as you enter addition statements. Can you use logic to open the safe?
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Light the Circles
Elevate addition practice with a fun dose of logic as you form given sums. A variant of my Arranging Addends puzzles.
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Build Me
Use logic to place tiles in a grid. A puzzle designed by Toni Cameron of ReimaginED Teaching.
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Log Calculator
Logarithms come to the rescue when a quirky calculator foils your attempts to multiply and divide large numbers.
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Fraction Finder
Use a variety of clues to determine the location of points on a number line. All locations are fractions.
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Transformation Islands
Guide a point through lava fields to build an embodied understanding of reflection and rotation.
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