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.

Pin it!
Google Plus

Search Results

ComputingPi
Geometry

Computing Pi

6-8, 9-12
Compare two methods for computing pi in this applet.
FreeRide
Number and Operations

Free Ride

6-8, 9-12
Explore fractions using the context of a bicycle and gear ratios.
GraphCreator
Geometry

Graph Creator

6-8, 9-12
Use this vertex-edge tool to create graphs and explore them. Investigate ideas such as planar graphs, complete graphs, minimum-cost spanning trees, and Euler and Hamiltonian paths.
Concentration
Geometry

Concentration

Pre-K-2, 3-5

Play a matching game with different representations of equivalent items.

FiveFrame
Number and Operations

Five Frame

Pre-K-2
The four games that can be played with this applet help to develop counting and addition skills.
TenFrame
Number and Operations

Ten Frame

Pre-K-2
The four games that can be played with this applet help to develop counting and addition skills.
HowManyUnderTheShell
Number and Operations

How Many Under the Shell?

Pre-K-2
Use this tool to practice addition and subtraction with Okta, the octopus.
AreaTool
Geometry

Area Tool

6-8
Use this tool to determine how the length of the base and the height of a triangle, parallelogram, or trapezoid can be used to determine its area.
CompoundInterestSimulator
Algebra

Compound Interest Simulator

9-12
This applet will allow you to investigate savings account earnings, credit card debt, and a stock market simulation.
PrimaryKrypto
Number and Operations

Primary Krypto

Pre-K-2, 3-5, 6-8
Combine five number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a "target" number.