A task using multiple representations helps students write explicit algebraic equations.
Editor's note: For photographs of a three-dimensional sculpture based on a Sierpinski triangle, see “Mathematical Lens,” MT April 2014, pages 414 and 415.
J. Vince Kirwan, firstname.lastname@example.org, is a doctoral student in mathematics education at Illinois State University in Normal. He is interested in generalization and teacher preparation.
Jennifer M. Tobias, email@example.com, is an assistant professor of mathematics education at Illinois State University. She is interested in how students develop an understanding of mathematics and in teacher preparation.