A concrete approach to prime numbers is presented using rectangles and triangles to construct a building for each number so that each story represents a pair of factors and the triangular-shaped roof represents the number. (MP)

Four elementary mathematical games and three parodies of Poe's "The Raven" are presented. (BB)

Patterns and relationships found in the multiplication table of the numbers zero through nine are discussed as a means to helping students understand certain concepts. (MP)

The representation of equivalent fractions is traditionally illustrated by diagrams showing division of units into parts. A second approach using linear graphs is suggested. (SD)

Three worksheets explore perfect, deficient, abundant, and amicable numbers by attaching mystical connotations to numbers and their divisors. (JT)

Described are children's strategies in thinking about fraction order and equivalence. The data are based on two teaching experiments with fourth and fifth-grade children. Some sample activities for teaching order and equivalence are included. (RH)

The development of a quantitative concept of rational numbers was explored in interviews with 16 fourth and fifth graders in two cities. High performers used a flexible and spontaneous application of concepts of rational number order and fraction equivalence, and a reference point, while low achievers tended not to. (MNS)

The place of binary arithmetic in the curriculum is discussed, then uses of binary coding for methods of automatic error correction in computers and calculators are analyzed. (DT)

Determining the day of the week on which Christmas falls each year is explained. (DT)

This article discusses the use of the balance beam in developing concepts of equality and inequality and in showing the basic arithmetic operations. (DT)

The rationale for teaching different number bases is discussed, and an approach for teaching the base 4 system is suggested. (DT)

Describes several activities to provide opportunity for the discovery of number patterns and shows the need for care in the descriptions of such patterns. (Author)

Worksheets provide activities with a modified number line and involve ordering numbers, number facts, and estimation. A suggestion for a bulletin board display is included. Two problem posters are also provided. (DT)

Chains made up of alternate arrows and numbers are used to represent the result of repeated applications of a function. A collection of problems based on these arrow chains is provided. (DT)