A card-sorting task can help students extend their understanding of functions and functional relationships.

Contributor Notes

Amy F. Hillen, ahillen@kennesaw.edu, is an assistant professor of mathematics education at Kennesaw State University in Georgia, where she teaches mathematics content courses for preservice elementary school teachers.

Luann Malik, lmalik@chccs.k12.nc.us, is mathematics coordinator at Chapel Hill–Carrboro City Schools in North Carolina. A mathematics teacher and teacher educator, she has designed research-based professional development for secondary school mathematics teachers.

(Corresponding author is Hillen ahillen@kennesaw.edu)
(Corresponding author is Malik lmalik@chccs.k12.nc.us)
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