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.
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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.
