Teacher tips are presented concerning geometry laboratory work, mathematics history, development of problem situations, and use of transparencies in graphical exercises in secondary school mathematics classes. (JG)

Included are worksheets on visualization of three dimensions for use in the classroom. The activities include: counting cubes in an arrangement (grades 1-3), constructing a cube with paper (4-6), and visualizing a large cube constructed with smaller cubes (6-8). (RS)

Develops two-dimensional descriptions of degenerate transformations using elementary matrix algebra. (RS)

The first section promotes use of student notebooks in mathematics instruction as incentives for pupils to do daily work. Part two looks at a geometric interpretation of the Euclidean algorithm. The final section examines an open box problem that is thought to appear in virtually every elementary calculus book. (MP)