After prime factors of a set of numbers are listed, geometric shapes are used to find the prime factors of the least common multiple (LCM). (MNS)

Past beliefs about numbers are presented, concerning odd, even, perfect, prime, and amicable numbers; specific numbers between 1 and 13; gematria or assigning values to letters; and numerology. (MNS)

Microcomputer programs that help students calculate permutations and combinations are developed. Listings of five programs are included. (MNS)

Exploring the strategies used in simple games for two players is discussed. Six games are briefly described, followed by suggestions for analyzing them. (MNS)

Presents activities designed to help young children learn basic notions of estimation (or "about how much"). The subcategories included in the article are: "About How Many"; "About How Long or How Far"; "About How Big"; and "About How Many with Very Large Amounts." (MNS)

The number sense program in Texas was developed to help motivate students to learn mathematics and to literally develop "number sense." A description of the program, a 70-item exercise (with answers), and teaching tips are provided. (JN)

A study of a class of numbers called 'Good numbers' can provide students with many opportunities for investigation, conjecture, and proof. Definitions and proofs are presented along with suggested questions. (MNS)

Writing short computer programs can help students to develop an understanding of random processes in probability. Three sample programs are included. (MNS)

How to take an existing magic square and surround it with a magic border is described, with a number of examples. (MNS)

Demonstrated is how the concept of equivalence classes modulo n can provide a basis for solving a wide range of problems. Five problems are presented and described to illustrate the power and usefulness of modular arithmetic in problem solving. (MNS)

The historical origin of star-polygons is noted and the mathematics of them presented, with illustrations. Seven theorems are included, as well as a computer program designed to classify star-polygons. (MNS)

Constructing solids, number of possible solids, properties of the series, general terms, and sum of the series are each described and illustrated. (MNS)

The relationship between automatization ability, as measured by the "Rapid Automatic Naming Test" (RAN), and proficiency in arithmetic basic fact computation was investigated with 120 learning disabled (LD) and 120 nondisabled children between 8 and 13 years of age. (Author/SW)

A math strategy using an "add-card" which illustrates simple addition facts was originally developed for learning disabled students but was also successfully used with mildly retarded students. (CL)

The rules for playing the medieval game of Rithmomachia, a battle of numbers, is described. Moves, rules of capture, play with the pyramids, components of pyramids, victories, and hints on strategy are each given. (MNS)