A series of questions can be posed and resolved in the process of teaching that the decimal expansions of rationals are terminating or repeating. (SD)

Number bases other than ten can be introduced effectively by presenting fictional civilizations which use them. (SD)

The system of International Standard Book Numbers uses a check code based on modular arithmetic. This system, the use of a simple machine to compute check digits, and related classroom activities are described. (SD)

Activity questions based on the prime factorization of numbers can be answered by reference to the lattice structure of factors. (SD)

The author argues that with the adoption of the metric system of measurement, common fractions became inappropriate to the school mathematics curriculum. (SD)

An attempt to introduce subtraction of negative integers early in the secondary school curriculum is described. The attempt was not successful, and several aspects of the experiment are discussed. (SD)

Some methods for teaching fractions are presented. (DT)

Four reasons for teaching fractions to children are discussed. (DT)

The author discusses the impact of mathematical developments around the turn of the century, and historical concerns and development of mathematics education. This article is a continuation of SE 515 504. (SD)

In response to an earlier article advocating the elimination of fractions from the curriculum, the author argues for their retention. He points out examples of their use in music and physic, and discusses methods of presenting operations on fractions. (SD)

The effect of the use of hand-held calculators on the arithmetic curriculum is explored. (SD)

Some of the points of view and facts expressed by employers at a conference of mathematics educators and businessmen are related. (SD)

Figurate numbers based on seven geometric figures are discussed. The place of these numbers in Pascal's triangle is indicated. (SD)