Discusses two mathematical ideas that come from the Incan and Mayan cultures: (1) the quipus, an Incan recordkeeping tool that encoded data via a logical-numerical system on spatial arrays of colored, knotted cords; and (2) the link between recording time and counting in the Mayan culture. (MDH)

Describes a study to determine middle school children's representational strategies to form part-whole or part-part relationships for relational numbers such as proportions, ratios, or fractions. Quantitative and qualitative analysis revealed that children prefer a part-part representation to solve relational quantity problems. (15 references)…

A study documented 10 college students' understanding of the limit concept and the factors affecting changes in that understanding. Encouragement by the researchers for the students to change their common informal models of limit to more formal conceptions were met with extreme resistance. (Author/JJK)

Discusses the rationale and a method for the instructional use of graphing calculators as an intermediary step between the intuitive notion of the concept of a limit and its formal epsilon-delta definition. (JJK)

Schematic knowledge was assessed by asking 195 ninth and tenth graders to classify area-of-rectangle problems in terms of whether the text provided insufficient, sufficient, or irrelevant information for solution. The hierarchical ordering of templates for the area of a rectangle is demonstrated, and implications for mathematics instruction are…

Shares observations made by a third-grade teacher who experimented with a variety of strategies to improve her students' abilities to write about mathematics. Notes that this gave the teacher a greater understanding of how students approached solving math problems and helped students practice writing in a meaningful way. (SR)

Activities that illustrate a problem-solving approach to teaching grouping symbols, such as parentheses and brackets, are described. Suggested exercises, answers to those exercises, and variations of this activity are included. (KR)

Presented are 44 examples in which students are invited to guess what pattern of numbers is emerging and to decide whether the pattern will persist. Topics of examples include Pascal's triangle, integers, vertices, Fibonacci numbers, power series, partition functions, and Euler's theorem. The answers to all problems are included. (KR)

The sign-chart method is often used to solve polynomial inequalities involving products or quotients. Presented are examples that extend this method to solve higher-degree polynomial, radical, exponential, logarithmic, absolute-value, and trigonometric inequalities and whose graphic representations lead to intuitive discussions of continuity. (MDH)

Based on a teacher's experience of teaching third-grade mathematics, this article reviews some of the problems faced in representing mathematical concepts to children, respecting children as mathematical thinkers, and creating a sense of community in the classroom. (MDM)

Presented is a conversation with students that gives an insight into the ways students think about decimals. Students were introduced, with the use of a calculator, to decimal notation and systematic experimentation. What students had learned throughout this conversation is discussed. (KR)

Investigated was the learning of the mathematical uses of "more,""fewer," and "less" at a very early stage in the development of ideas. (CW)

Presented is a method which may be used to help students start their own original investigations and create their own conjectures about fundamental mathematics concepts. An example of this method is provided. (CW)

Presents thought experiments and science activities for helping students think about quantum mechanics and the idea of randomness. (PR)