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Maths on the Back of an Envelope: Clever Ways to (Roughly) Calculate Anything

Rob Eastaway



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Harper Collins
03 September 2019
Mathematics & Sciences; Philosophy of mathematics; Mathematical logic
'Another terrific book by Rob Eastaway' SIMON SINGH 'A delightfully accessible guide to how to play with numbers' HANNAH FRY How many cats are there in the world?

What's the chance of winning the lottery twice?

And just how long does it take to count to a million?

Learn how to tackle tricky maths problems with nothing but the back of an envelope, a pencil and some good old-fashioned brain power.

Join Rob Eastaway as he takes an entertaining look at how to figure without a calculator. Packed with amusing anecdotes, quizzes, and handy calculation tips for every situation, Maths on the Back of an Envelope is an invaluable introduction to the art of estimation, and a welcome reminder that sometimes our own brain is the best tool we have to deal with numbers.
By:   Rob Eastaway
Imprint:   Harper Collins
Country of Publication:   United Kingdom
Dimensions:   Height: 204mm,  Width: 135mm,  Spine: 21mm
Weight:   280g
ISBN:   9780008324582
ISBN 10:   0008324581
Pages:   208
Publication Date:   03 September 2019
Audience:   General/trade ,  ELT Advanced
Format:   Paperback
Publisher's Status:   Active

Rob Eastaway has been one of the UK's most successful popular maths authors of the last 15 years. His books include the bestselling Why Do Buses Come In Threes? and Maths for Mums and Dads. He is the Director of Maths Inspiration, a national programme of theatre-based lectureshows for 15-17 year olds that has reached over 150,000 teenagers since it began in 2004. Rob regularly gives talks to all age groups in primary and secondary schools, appears on BBC Radio 4's current affairs/numbers programme More or Less, and works closely with National Numeracy, the national charity that campaigns for better adult numeracy. In 2017, Rob received the Zeeman medal for excellence in communication of maths to the general public.

Reviews for Maths on the Back of an Envelope: Clever Ways to (Roughly) Calculate Anything

`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

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