Conceptualizing Ratios with Look-Alike Polygons
Nancy K. Dwyer, Betty J. Causey-Lee, and Nekeya M. Irby
April 2003, Volume 8, Issue 8, Page 426
Article describes using similar rectangles to help children conceptualize ratio relationships in several different ways. Proportional reasoning is developed without introducing the process of cross-multiplication. Activity is included.
Ratios / Proportions