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November 2001, Volume 7, Issue 3


By the Unit or Square Unit?
Bellasanta B. Ferrer, Bobbie Hunter, Kathryn C. Irwin, Maureen J. Sheldon, Charles S. Thompson, and Catherine P. Vistro-Yu
Three ways in which teachers help their students understand that the most compact two-dimensional shape has the greatest area for a given perimeter.

Developing an Area Formula for a Circle with Goldilock and the Three Bears
Jerry A. Ameis
Description of a grade-5 student developing an area formula for a circle where pi is approximated by 3.

Subtracting Integers: An Affective Lesson
Gerald Petrella
How teacher awareness of the middle school students' real world coupled with a teacher's perspective can inspire an effective mathematics lesson. Lesson description included.