Presents an activity, "Lisa's Lemonade Stand," that actively engages students in algebraic thinking as they analyze change by investigating relationships between variables and gain experience describing and representing these relationships graphically. (YDS)

Describes the work of one mathematics teacher as she uses literature to make factorials both interesting and comprehensible to middle school students. (Contains 10 references.) (YDS)

Presents a measurement problem that can be explored by students of varying ability. Discusses aspects that make it accessible in a heterogeneous class. (YDS)

Presents a mathematics activity that teaches binary code. (YDS)

Uses a Calculator-Based Ranger and a graphing calculator in problem-solving mode to introduce an exploration of graphing-related concepts including intercepts, slopes, and rate of change. (YDS)

Explains the basics of spherical geometry and describes a series of activities developed for grade 6 middle school students. (YDS)

Describes the implementation of a real-world context focused on teaching proportional reasoning. (YDS)

Describes a lesson plan in which students design scale models of kitchens using proportional reasoning and measuring skills. (YDS)

Discusses problem solutions for questions originally posed in the column "Food for Thought from Jay's Diner." (YDS)

Shows how students explored geometric properties of the South Korean flag using proportional reasoning. (YDS)

Provides classroom suggestions for combining numerical, algebraic, and geometric techniques with the understanding of a simple method for computing square roots. Historical origins of the method illustrate the debt owed to ancient minds living in what are now India, Pakistan, Iraq, and Egypt. (Author/NB)

Examines student solution strategies to a problem that appeared previously in this journal. (YDS)

Focuses on the importance of building from mistakes in mathematics instruction to develop better reasoning and problem-solving abilities. (Contains 11 references.) (YDS)

Presents the Shopping Spree problem to teach students the concept of estimation. (Author/NB)

Describes the development of mathematical thinking as children construct a mini mall. Students learn the importance of cooperation with their peers as they explore mathematical concepts such as one-to-one correspondence, classification, intersection of sets, coin identification and values, addition, subtraction, and problem solving. (Author/NB)