Worksheets are provided for an activity involving the use of the calculator in discovering patterns when a number is divided by 9, 99, or 999. (DT)

Queuing theory is explored by considering a simple example and by simulation with a computer. Sample BASIC computer programs are included. (DT)

President Garfield's life is reviewed, and his proof of the Pythagorean theorem is presented. (DT)

Arithmetic drill problems which use number codes are suggested. (DT)

This article investigates the transformations which result when all variables and constants in given functions are allowed to be complex numbers. (DT)

This article presents, in the context of solving a specific mathematical problem, an argument to indicate how problem posing can lead to a deeper understanding of what is involved in the act of problem solving. (DT)

Four problems concerning the maximum number of regions determined by circles and polygons are explored. (DT)

A geometric interpretation is given to the arithmetic, geometric, and harmonic means of two positive numbers a and b, and a fourth fundamental mean, the root mean square, is introduced. Results are generalized to three dimensions, and other types of means are discussed. (DT)

This article presents a geometric construction in which the quadratic, arithmetic, geometric, and harmonic means are drawn together in a single diagram. (DT)

The construction of a nomograph for the harmonic mean is explained, and several problems involving the harmonic mean are stated and proved. (DT)

Data from an electrocardiagram are analyzed mathematically in order to determine specific heart abnormalities. The mathematics behind one such problem is explained. (DT)

An algebra problem is analyzed, and several variations are suggested for further student inquiry. Practical applications of the problem are discussed. (DT)

Instructions are given for making a solid from unit cubes joined face to face. Activities lead to design and construction of the SOMA cube, along with other cube puzzles. (DT)

A card game is described which gives students practice with adding integers and which also develops the concept of "opposite." (DT)

Symmetry properties of wallpaper patterns are analyzed. (DT)