Can't remember the difference between a prime number and a square number? Forgotten how many sides on a pentagon (5), heptagon (7), or nonagon (9)? Then you need DK's new "Math Dictionary " Inside, you'll find more than 300 entries on the words, phrases, and concepts used by grade-school students in their math classes and in their lives outside school.

Here's real help for math students. From abacus to zero property of multiplication, this handy reference guide for students contains more than five hundred common mathematical terms. Written in simple language and illustrated with hundreds of helpful photographs and drawings, Math Dictionary takes the mystery out of math.

- Great Study Aids! - Topics arranged thematically so that words are explained in context - Fully integrated system of cross referencing plus a comprehensive index.

Illustrations and simple definitions covering such areas as number sense and operations, algebra, basic geometry, and data representation.

Contains more than four hundred math definitions that will help students solve many of the math challenges they face. Includes instructions for basic operations and tables of commonly-used facts and equivalents.

Helped with bright illustrations, each concept is explained alongside worked examples of alternative methods as well as hints and tips for shortcuts and strategies. Ages 7+.