When calculating the area of a trapezoid, students use a range of problem-solving strategies and measurement concepts.
Agida G. Manizade and Marguerite M. Mason
Bobson Wong and Larisa Bukalov
Parallel geometry tasks with four levels of complexity involve students in writing and understanding proof.
Exploring even something as simple as a straight-line graph leads to various mathematical possibilities that students can uncover through their own questions.
Carol J. Bell
Reasoning and Proof is one of the process standards set forth in NCTM's principles and standards for school mathematics (2000).