The author illustrates a method for the construction of the eight deltahedra, using cardboard and rubber bands. (MN)

A method for obtaining the least common multiple and the greatest common factor of a pair of numbers without using prime factorization is examined. (JT)

A program of outdoor mathematics instruction is described through classroom and outdoor activities involving orienteering, which is an application of linear measure and compass and map reading. (JT)

Four worksheets are designed to provide practice with addition, subtraction, and multiplication of whole numbers and decimals. (JT)

Meterological information is used to develop a mathematical function resembling the sine function. (JT)

This paper discusses ways of discussing limits in the secondary classroom. Particular attention is paid to showing that hypothesized answers are not limits to given sequences. (SD)

termined that students who completed writing assignments on mathematics problems were better problem solvers than students in control groups, supporting the contention that expository writing is an effective, practical, and innovative tool for problem solving. (Sample problems and writing assignments are included.) (DH)

Three open-phrase games are presented which offer interesting experiences with substitution of numbers. Four open-sentence games are also described, two dealing with the initial stages of finding a partial solution and two requiring students to find the complete solution of an open sentence. (MNS)

Attitudes toward mathematics and attitudes toward computers were examined for 1,018 grade 8 students and 800 grade 12 students. The female students were more likely than the male students to associate negative attitudes toward mathematics with negative attitudes toward computers. Participation in an eighth-grade mathematics course with a computer…

Presented are some concerns related to the diagnostic/prescriptive approach to teaching mathematics. The author supports the view that teachers need to become aware of reasons for making professional decisions and become reflective practitioners. (RH)

Presents a variety of mathematics activities for students to solve. Sections are included on geometrical dissection, prime numbers, trigonometry, and number concepts. (RH)

Presented are activities and references involving tangrams. Seven pieces are cut from a single square of paper; other shapes and objects are made from these pieces. (RH)

This interview with the six members of the 1985 American team to the International Mathematical Olympiad (IMO) focuses on such areas as their evolving mathematical knowledge, mathematical pursuits, accomplishments, and interests. Also included are biographical sketches of the team members and the 1985 IMO problems (with solutions). (JN)

How to construct a magic square is explained and a computer program is listed. A proof is presented. (MNS)

Problems set in the real world help students see the relevance of mathematics. Topics that provide sources of real problems are discussed, with examples: mazes, packing, and networks. (MNS)