A geometric approach using exact square manipulatives can promote an understanding of the algorithm to dismantle radical expressions.
Kyle T. Schultz and Stephen F. Bismarck
Christopher E. Smith
Considering circles in taxicab geometry helps students with Euclidean concepts.
Chalk Talk and Claim-Support-Question are two routines for developing students' ability to use multiple representations and encouraging classroom discussion.
Jeffrey J. Wanko, Michael Todd Edwards, and Steve Phelps
The Measure-Trace-Algebratize (MTA) approach allows students to uncover algebraic relationships within familiar geometric objects.
Carol J. Bell
Reasoning and Proof is one of the process standards set forth in NCTM's principles and standards for school mathematics (2000).