Twenty puzzles originally posed by Sam Loyd (1841-1911) are presented. Solutions are provided. (SD)

A series of maps is presented for coloring with the fewest possible colors. (SD)

Convex polyhedra having square or triangular faces are analyzed algebraically. (SD)

A survey of more than 6,000 secondary-school students was conducted to determine student perceptions of their teachers and classes. The results concerning mathematics classes are summarized in this paper. Implications for instruction are discussed. (SD)

The game of roulette is analyzed. (SD)

Graphs of exotic functions which can be defined using algebraic operations are discussed. (SD)

Lines in the coordinatized plane which do not go through the origin can be designated by the ordered pair of intercepts. The enrichment unit described illustrates duality in mathematics. (SD)

A computer program developed by a high school student approximates the value of "e" by computing partial sums of the defining series. (SD)

A method of approximating the point "c" at which a continuous function attains its mean value over an interval is described. The method is applied to tax tables. (SD)

Equations or systems of equations can be associated with letters of the alphabet printed in the coordinate plane. Messages can be coded and decoded with a computer or by hand. (SD)

Some computations when done on the hand calculator yield results which can be read as words or phrases. (SD)

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

Problems involving the generation and counting of isosceles triangles interior to a given isosceles triangle are described. (SD)

Ancient numeration systems form the basis for these worksheets. (SD)

Statements of George Washington, Benjamin Franklin, John Adams, and Thomas Jefferson concerning mathematics are quoted and discussed. (SD)