Elementary differential calculus is used to analyze and to discuss some complex economic situations. (JT)

A computation learning lab was planned, implemented, and evaluated as a way of helping learners conquer computation problems. Features include: emphasis on a premotivation activity; the use, on a regular basis, of eight instructional strategies; and active parent support. The lab students showed dramatic gains. (MP)

Classroom activities that provide meaningful practice, and at the same time motivate students, are the subject of this article. Several activities appropriate for first-year algebra are discussed; e.g., a prepared matrix of algebraic numbers, cross-factor puzzles, and number tricks. (MP)

This article describes how logic is used as the basis of medical diagnosis, i.e., the presence or absence of certain symptoms implies the presence or absence of certain diseases. This usage is then illustrated with a real example. (MP)

The patterns of the coefficients in the expansion of (x + y +z)n are discussed, and a recursive property is developed as a generalization of the Pascal triangle. (MP)

Contained in this column are articles discussing the following topics: cross-number puzzles, an intuitive development of pi, a three-column proof format, and an easily constructed kit to be used in acquainting students with the wrapping function used in introducing circular functions. (MP)

The objective of this activity is to provide a calculator experience developing and reinforcing the concept of order of operations. Three worksheets are provided that are suitable for reproduction for classroom use. Teacher instructions and answers are provided. (MP)

This article shows how an inexpensive calculator can be used advantageously to determine repeating decimals. Even the decimal representations of numbers, such as one-seventeenth and one-nineteenth, can be easily computed. Many examples are given, and some theoretical discussion is included. (Author/MP)

The purpose of this article is to point out some of the problems that arise in the use of calculators to illustrate derivatives, due to rounding or truncation, by the calculator. Several illustrations of numerical differentiation techniques are also given. (Author/MP)

For STET students who still have difficulty with the basic operations on whole numbers, the author has developed a "periodic table" of whole numbers, which can be used to add, subtract, multiply, and divide. (MP)

This discussion of the accomplishments of Buckminster Fuller describes the geodesic dome, the Dymaxion principle and its applications, and the Octet-Truss principle. (MP)

Some practical, hands-on ways in which ideas about geodesic domes can be used in secondary school mathematics are described. Instructions for constructing a one-frequency geodesic sphere are given. (MP)

A method is given for the analysis of geodesic domes involving plane geometry. The method shows how to calculate all necessary angles and chords, given the length of one side. (MP)

This discussion of the results of the mathematical Olympiad contains the average scores on each of the five problems, the winner of the Olympiad, and the Olympiad problems. (MP)

This monthly column contains teaching suggestions on: using codes to convey information, flow proofs in geometry, and volleyball and probability. (MP)