Students stroll through distance, rate, and time experiments on the road to strengthening their understanding of proportionality.

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### Carole E. Greenes, Mary C. Cavanagh, Jenny K. Tsankova, and Florence A. Glanfield

### Margaret cibes, James Greenwood, and G. Patrick Vennebush

Students analyze items from the media to answer mathematical questions related to the items. This month's clips are from an ad for HDTVs, which involves trigonometry and calculus, and from a sportscast, which involves probability and the binomial distribution.

Readers comment on published articles or offer their own ideas.

A set of problems of many types.

### Michael H. Koehler

The sculpture entitled Four-Sided Pyramid by Sol LeWitt (1928-2007) is located in the National Gallery of Art Sculpture Garden on the National Mall in Washington, D.C. Installed in 1999, the sculpture takes on a different appearance depending on light conditions and the location of the sun. The square pyramid consists of rectangular blocks stacked twenty-four levels high. It comprises twenty-three vertical slices of blocks from the front to the back of the pyramid and forty-seven rows of blocks from one corner of the base to the opposite corner. The blocks are rectangular prisms of dimensions 1 × 1 × 2 units; thus, each block can be thought of as consisting of two cubes.

Readers comment on published articles or offer their own ideas.

### Pamela J. Dunston and Andrew M. Tyminski

Techniques for teaching mathematics terminology allow adolescents to expand their abstract reasoning ability and move beyond operations into problem solving.

A set of problems of many types.

### Günhan Caglayan

Students analyze a photograph to solve mathematical questions related to the images captured in the photograph. This month, photographs of ancient arches lead to a discussion of inscribed polygons.

### Leigh Haltiwanger and Amber M. Simpson

Allowing students to write in mathematics class can promote critical thinking, illustrate an awareness of mathematical connections, and result in clear communication as they share ideas comfortably with peers.