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.

any fair two-sided coin

Approximately cylindrical food items that can be easily sliced. Examples include carrots or cheese sticks.

We specified linguine since it is flatter and less likely to roll around than spaghetti.

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

Figures cut from cardboard or card stock with at least one straight side that can be taped to a pencil. Shapes might include various polygons, half-discs, and composites of these.

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.