Reanalyzes the terminal secondary student performance data in the International Study of Achievement in Mathematics (ISAM), comparing achievement of United States students to that of students from the other developed countries in the ISAM. (JN)

Students from two junior high school mathematics classes were assigned either to a treatment in which every homework problem was graded or to one in which a random half of the problems were graded. There were not significant differences between treatment groups on achievement after a six-week period. (JP)

Graphing techniques are used to demonstrate the inverse function theorem and that the graph of the inverse function can be obtained by flipping the graph about the line y=x. (MP)

It is shown that a unit segment can be constructed from a given line segment of length the square root of x if x is a surd. (MP)

An alternate method for factoring quadratic equations is presented as being quicker and easier to use than the trial-and-error method. (MP)

The article presents and discusses an optimization problem concerned with observing objects from a moving car. (MK)

The topics of angle construction, angle trisection, and regular polygon construction with only a straightedge and compass are discussed for angles with integer measure. (MP)

A variation of the classical birthday problem is considered. A BASIC program is included in the article. (DT)

Analyzing the effects of tilting a probability board can be an effective method of introducing a discussion of models in a probability class. (SD)

Students in nine classes were randomly assigned to treatment groups receiving (1) written comments on their homework papers or (2) no comments. In two of the classes, the students receiving comments showed achievement superior to that of the others. In the remainder of the classes there was no difference. (SD)

The principles of modern genetics are extended to study the extinction probabilities of such genetic diseases as sickle-cell anemia, Tay-Sachs disease, and cystic fibrosis. (JT)

The problems involved in making reservations for airline flights is discussed in creating a mathematical model designed to maximize an airline's income. One issue not considered in the model is any public relations problem the airline may have. The model does take into account the issue of denied boarding compensation. (MP)

The unmarked protractor appears to have been ignored in considerations of construction tools other than the standard straightedge and compass. Some geometric problems are presented which are designed to be done using only the unmarked protractor. They are thought to provide challenges to better students. (MP)

Describes a way for students to learn to solve linear equations using physical objects (pan balances), diagrams, and symbols. Provides diagrams illustrating the method and five problems. Nine references are listed. (YP)

Students use a series of isosceles right triangles constructed on a geoboard to discover patterns and form generalizations. (MP)