Tetonor rules: each number in the main grid can be formed by adding or multiplying a pair of numbers in the strip below the grid. Each pair of numbers should be

Dozens of compelling and addictive mathematical puzzles twillchallenge your mental arithmetic and powers of deductive reasoning. Tetonor rules: each number in t

Challenge yourself at home with number puzzles If you relish a serious mental challenge, this collection of teasers will demand your very best lateral thinking

A mental workout to rival Su Doku! Dozens of compelling and addictive maths puzzles to challenge your mental arithmetic, multiplication skills and powers of ded

The Rough Guide to Yellowstone & Grand Teton is your definitive guidebook to this storied region of the American west; designed to help you best enjoy your trip