The Magic of Flexagons
$14.95
Flexagons are made by folding paper in certain ways and when they are flexed, turned and unfolded in different ways, they show puzzling and curious effects. Some of this extensive collection are in the form of puzzles to be solved, others have rather mysterious properties. By David Mitchell. Paperback, 8-1/4" x 11-1/2", 32 pages.
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Up With Math, Third Edition
$19.95
By Ron McCully. A step-by-step program to develop basic math skills, with chapters on whole numbers, perimeter and area, decimals, fractions, and percent. Up With Math teaches the detailed steps needed in computation. It focuses on an important subskill in each lesson. It explains each example clearly and patiently in a step-by-step style. It offers many practical applications as a realistic approach to problem solving. Student progress is evaluated with chapter self tests and a separate achievement testing program referenced to the performance objectives for each lesson. Paperback, 8-1/2" x 11", 286 pages.
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Inversions
$14.95
By Scott Kim. Each word in Inversions exhibits striking geometrical symmetry. For instance, the word mirror is written with reflectional symmetry; symmetry reads the same upside down; and infinity spirals off to infinity. The accompanying essays connect mathematics and symmetry with art, psychology, and music. One of the sections shows students how to create their own inversions. 8-1/2" x 11", 128 pages.
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Mazes Ancient and Modern
$9.95
By Robert Field. From the tradtional turf mazes of medieval times and hedge mazes such as the one at Hampton Court to modern mazes made in a variety of new materials including bricks, mirrors and water jets - even enormous maize mazes which are cut out of fields of growing corn and which last for a single summer season. This book traces the history of the maze in all its forms and uses a mixture of photographs and drawings to offer a fascinating insight into them. 6" x 8-1/4", 64 pages.
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