Maths on the Back of an Envelope by Rob Eastaway Some people think maths is all about getting a precise answer. But there's a vital type of maths - 'impure maths' if you like - which is done on the back of an envelope, and where the answer is only a rough approximation. Rob Eastaway will demonstrate how back-of-envelope maths can help with anything from building a sports stadium to answering questions on Who Wants To Be A Millionaire?. Rob's Biog Rob Eastaway is an independent lecturer and author whose books on everyday maths include Why do Buses Come in Threes?, Beating the Odds and How Many Socks Make a Pair?. For several years he set puzzles for New Scientist and The Sunday Times, and he is often to be heard on radio talking about the maths of everyday life.

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