Inspired by Jeffrey Frykhom's book, Learning to Think Mathematically With the Number Line (available in the catalog in pdf format), I wanted to create a life-sized number line in my classroom. For ease of preparation, I installed a retractable clothesline.
Since the release of the free Geoboard App, I've used it to represent a variety of visual models. But I especially love its power when it comes to multiplying fractions. While a regular geoboard can be divided into parts to show a fraction, the app takes the visual model a step further with the ability to paint in the part of the fraction that you actually have.
Looking for ways to explore relationships between circumference, radius, diameter and area? Check out The Circle Tool from NCTM Illuminations. You’ll notice three buttons that run along the top of the game window: Intro, Investigation and Problems. With the Intro button selected, you’ll notice an icon of a video camera.