Several examples of concrete applications of negative numbers are given. (MM)

A description of a week's work in mathematics carried out by a first year group of grammar school boys, answering the question which is the title of this article. (MM)

A discussion of some number patterns which arose from a consideration of the number of diagonals of a general polygon. (MM)

A Snip of the Scissors" describes the geometry involved in making stars by paper folding, and Checking the Calculated Average Through Subtraction" suggests practice in operations with negative numbers. (MM)

Discussed are new media being used in classroom mathematics instruction; television, computers, programed materials, films, games, manipulative materials. (CT)

The author examines the tests of the IEA International Study of Mathematics Achievement that were given to the 13-year-old subjects. In particular, he investigates the appropriateness of the tests for U.S. students and concludes that with respect to the material for which the U.S. students should be held responsible, they did well. (CT)

Proposes an undergraduate program for preservice secondary school mathematics teachers based on study of state teacher certification requirements. Four and five year curricula including professional, general education and mathematics courses are described. (JM)

Describes an experimental study attempting to construct a unified school mathematics curriculum for grades seven through twelve. Study was initiated in 1965 and is to be a six-year study. The total program includes, in the following order, syllabus writing, conferences, writing of experimental textbook, education of classroom teachers, pilot class…