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.

## Search Results

### IGD: Perpendicular Bisector

9-12
Use this tool to demonstrate how to draw a perpendicular bisector.

### IGD: Simson Line - Orthocenter

9-12
Use this tool to explore how the Simson line of a triangle is related to the orthocenter.

### Isometric Drawing Tool

3-5, 6-8, 9-12
Use this interactive tool to create dynamic drawings on isometric dot paper.

### KenKen

Pre-K-2, 3-5, 6-8, 9-12
Developing Calculation Skills, Logical Thinking and Persistence with a Puzzle Game

### Line of Best Fit

6-8, 9-12
Use this activity to practice how to enter a set of data, plot the data on a coordinate grid, and determine the equation for a line of best fit.

### Linear Regression I

6-8, 9-12
Investigating a Regression Line and Determining the Effects of Adding Points to a Scatterplot

### Name Letters

3-5, 6-8, 9-12
Use this activity to practice solving systems of equations. Use this tool to check students' answers.

### Tower of Hanoi

6-8, 9-12
Use this applet to solve the Towers of Hanoi puzzle: move all the discs from the first peg to the last.

### Times Table

Pre-K-2, 3-5
This tool allows you to practice multiplying single-digit numbers.

### The Quotient Cafe

3-5, 6-8
Use this applet to illustrate division and remainders by the division of food to aliens, dinosaurs, penguins and more.