Thank you for your interest in NCTM’s Illuminations. Beginning in mid-April, all Illuminations content will be moving to nctm.org/illuminations. Interactives will remain openly available and NCTM members will have access to all Illuminations lessons with new filtering and search options. We hope you will continue to utilize and enjoy these resources on nctm.org.

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TurtlePond
Measurement

Turtle Pond

Pre-K-2, 3-5, 6-8
Estimate length and angle measure while guiding a turtle to a pond using computer commands.
TwoTerrains
Algebra

Two Terrains

9-12
Use this applet to determine the best path for a vehicle that can't go as fast when it travels off‑road.
VectorInvestigationBoatToIsland
Geometry

Vector Investigation – Boat to Island

6-8, 9-12
This tool shows vector addition by a boat going through a current to get to a target.
AdjustableSpinner
Data Analysis and Probability

Adjustable Spinner

Pre-K-2, 3-5, 6-8, 9-12
Use this tool to create a spinner to examine experimental and theoretical outcomes.
BobbieBear
Data Analysis and Probability

Bobbie Bear

Pre-K-2, 3-5

Use counting strategies to make outfits for Bobbie Bear with different colored shirts and pants.

Click here to play Bobbie Bear in Spanish.

BoxPlotter

Box Plotter

3-5, 6-8, 9-12
Use this applet to create a customized box plot with your own data, or display a box plot of an included set of data.
Chairs
Algebra

Chairs

3-5, 6-8
This applet is used to explore the number of chairs needed when tables are rearranged in a restaurant.
CubeNets
Geometry

Cube Nets

3-5, 6-8
This applet allows you to examine various two-dimensional figures to determine which ones can be folded into a cube.
AngleSums
Geometry

Angle Sums

6-8
Explore the sum of the interior angle measures for various polygons using this tool.
CircleTool
Geometry

Circle Tool

3-5, 6-8
This activity allows you to investigate the relationships between the area and circumference of a circle to its radius and diameter.