Many students have a dominant part-whole conception of fractions. We examine why this is problematic and explore strategies to move students beyond this limitation.
Beware of “Gaps” in Students’ Fraction Conceptions
Patrick L. Sullivan, Joann E. Barnett, and Kurt Killion
Broken Ceiling Lights: Circular Area Without the Radius
Nicholas J. Gilbertson
A customer walks in to a lighting store with a broken ceiling light, and the solution to finding a replacement glass illuminates an alternative approach to finding the circumference and area of a circle without knowing the circle’s center, radius, or diameter.
Construct It! Progressively Precise: Three Levels of Geometric Constructions
Carmen Petrick Smith
This article shares an activity scaffolding the construction of the circumcenter of a triangle, culminating with a Triangle-Ball Championship game.
Give Plants an Inch; They’ll Take a Yard
Katherine N. Vela, Michelle Parslow, Rita Hagevik, and Kathy Cabe Trundle
A real-world integrated activity allows middle school students to design a scale drawing for a garden at their school.
Promoting Precision in a Virtual Environment
Kathryn Lavin Brave, Mary McMullen, and Cecile Martin
The application of exact terminology benefits students when forming and supporting mathematical arguments virtually.