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Copy the two sizes of strips on different colors of card stock so that students can see at a glance whether the two strips being used are congruent or not.
After the strips are cut, punch holes as indicated in each segment. A standard hole punch makes holes that are a little larger than needed for the metal paper fasteners, causing the cardboard strips to wiggle around. If possible, find a way to punch holes that are slightly smaller than the size of a standard hole punch.
A commercial version of these materials is available, sometimes called geo strips.
Index cards to use as straightedges, compasses, tracing paper, blank paper, colored pencils, and scissors.
Note: "Tracing paper" is easiest to use when it's a smaller size. Commercially available "patty paper" is 5 inches by 5 inches and ideal for this. If using larger sheets of tracing paper, consider cutting them down for student use.
Examples of graphing technology are a handheld graphing calculator, a computer with a graphing calculator application installed, and an internet-enabled device with access to a site like desmos.com/calculator or geogebra.org/graphing. For students using the digital materials, a separate graphing calculator tool isn't necessary—interactive applets are embedded throughout, and a graphing calculator tool is accessible on the student digital toolkit page.
brass brads
Flat mirrors. A mirror should be small enough to be portable, but large enough that it can be placed on the ground a few feet away from an observer, and the observer can site the top of a tall object in the mirror.
cubes with sides numbered from 1 to 6
Clear protractors with no holes and with radial lines printed on them are recommended.
Any way for students to create work that can be easily displayed to the class. Examples: Chart paper and markers, whiteboard space and markers, shared online drawing tool, access to a document camera.
Bundles of "patty paper" are available commercially for a very low cost. These are small sheets (about 5" by 5") of transparent paper.