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9780008444495

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'A delightfully accessible guide to how to play with numbers' - Dr Hannah Fry, author of Hello World and The Mathematics of Love 'Put aside those calculators and computers, and find a pen and piece of paper! In a collection of riveting tips and examples, Eastaway shows us amazing short-cuts to get rough answers to important questions. I still find it remarkable that 16% of 25 is exactly the same as 25% of 16!' - Professor Sir David Spiegelhalter, author of The Art of Statistics 'Another terrific book by Rob Eastaway' - Simon Singh 'Packed with fun examples and fresh ideas. I thought I was on top of this subject, but I learned a lot' - Tim Harford 'A joyful primer about the lost art of calculating without a calculator' - Guardian

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Rob Eastaway is a writer, speaker and consultant. His books include the bestselling What is a Googly? (9781861056290) and Why Do Buses Come In Threes? (9781861058621). He jointly devised the system now used to officially rank international cricketers and lives in London, where he is a keen weekend cricketer and occasional golfer.

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