Card Sorts are excellent activities. They offer flexibility! A card sort can be used at several different levels. It can be used as a discovery activity, a pre-test, and a post-test. The sort can be used as both a formative and a summative activity. The card sort works well if you use math stations. Students can work on the card sorts individually or in pairs. Sorts can be glued into notebooks, or checked as they are completed on the desk. (See my blog post on Card Sorts: http://bit.ly/whycardsorts )
This is a set of 48 cards representing 12 quadratic functions. Students match the graph to the equation, factors, and roots. All of these equations are basic quadratics in which "a" is equal to 1. This set could be used with advanced algebra students before a unit on Quadratics to see what they remember. It can be used as an introductory activity with beginning algebra students.
Besides asking students to match the cards, you could also ask them to identify the key characteristics of each such as the axis of symmetry, vertex, and intercepts of the functions represented.