Teach Yourself Mathematics Third Edition is an invaluable guide for anyone looking for a step-by-step introduction to key maths concepts and techniques. Packed full of worked examples, clear explanations and exercises (with answers), this book will guide you through the essentials quickly and painlessly. This new edition covers: - basic arithmetical processes, algebra and geometry - percentages, fractions and decimals - probability - expressing numbers as the products of prime factors - Pythagoras' Theorem and trigonometry - fractions and decimals - organizing and illustrating data - using ratio and proportion.