Data on computer literacy from the 1977-78 National Assessment of Educational Progress (NAEP) are discussed. (MP) Aspect of National Assessment (NAEP) dealt with in this document: Results (Interpretation).

Common mistakes pupils make when adding fractions are categorized and analyzed. (MP)

A nine-session mathematics conference for ninth graders is described. Guidelines for preparing such a conference are suggested. (MK)

A process for eliminating the xy term in a quadratic equation in two variables is presented. The author feels this process will be within the reach of more high school students than more commonly used methods. (MK)

The article presents a general test for divisibility that includes composite numbers and shows that such a test can be used to determine divisibility by several numbers simultaneously. (MK)

An algorithm for multiplying natural numbers is described. The algorithm provides a chance for some unusual drill and might serve as an enrichment topic. (MK)

A critique of a research report which previously appeared in this journal is given. The research, concerned with the underachievement of girls in mathematics, is lauded for its intent but criticized on several counts, including equating ability and attainment and the choice of attitude factors used. (MK)

Derivations of elementary trigonometric identities involving constants (namely, particular values of the sine function) are presented. (MK)

Activities to be used before teaching the Pythagorean Theorem are described. Sample worksheets are provided. (MK)

A 20-question quiz on the uses of numbers in the real world is presented. (MK)

Five graded sets of examples of alphametrics are provided. The puzzles are suggested for use in developing the traits of considering all possibilities and systematic working. (MP)

An activity is described for introducing some fundamental notions in inferential statistics to students in elementary high school statistics courses. (MP)

Detailed instructions are given for the construction of a nomograph that can be used to compare unit prices of packaged foods in a grocery store. (MP)

A discussion is given of the nature of spatial ability and a rationale is provided for use of spatial activities such as tiling, tangrams, and polyominoes. (MP)

Examined are the problem similarity dimensions perceived by a student when classifying mathematical word problems as related and the relationship between a student's perception of problem similarity and performance on achievement tests. (MP)