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The beautiful blonde arithmetician on Channel 4's longest-running quiz show Countdown, Rachel Riley has a Master's degree in mathematics, covering quantum theory, fluid mechanics and applied maths. But do you know your fractions from your percentages, your adjacent from your hypotenuse? Who really knows how to do long division? Fret not. You won't be at sixes and sevens for long with this brilliant guide as Rachel takes you back to the very basics to revisit what you learnt at school and may have promptly forgotten, giving you the essential toolkit to improve your numerical abilities. Packed with fool-proof methods, quirky trivia and puzzles to try, chapters include mental arithmetic, ravishing ratios, geometric bliss, trigonometry, algebra made awesome, graphs and other ways of displaying data, probability and statistics and thankfully all of the puzzle solutions. Rachel is the most personable and friendly guide. Mathematical diagrams and examples throughout. 376pp.