Maths on the Back of an Envelope, Rob Eastaway
Maths on the Back of an Envelope, Rob Eastaway
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Maths on the Back of an Envelope

Author: Rob Eastaway

Narrator: Rob Eastaway

Unabridged: 3 hr 36 min

Format: Digital Audiobook Download

Publisher: HarperCollins

Published: 09/19/2019

Synopsis

‘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, 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.

Reviews

Goodreads review by Domhnall on October 08, 2019

Calculators, computers, Google, Wiki, we can leave maths to machines, but we are left with the problem of interpreting numbers when we encounter them in everyday life, from special offers to politicians' promises. Is a billion pounds extra spending on the NHS a lot of money or loose change? How many......more

Goodreads review by John on October 31, 2019

The book is split into four parts, one about precision, one exploring the essential tools of estimation, one with estimation examples and one with curious "Fermi" problems. By far the most useful of these is the part which deals with equipping the reader with tools and tricks for calculating or estim......more

Goodreads review by Adelyne on December 05, 2020

This was the fun read that I expected from the title, and on such an important topic too - though this book really drives home the point that it really is all about (increasingly uncommon) common sense. I learnt a trick or two in this one, which was quite nice, despite the fact that I think I am rel......more

Goodreads review by Maurizio on May 17, 2021

Spannometria pratica Rob Eastaway è un noto divulgatore matematico britannico. In questo libro ) si è dedicato alla spannometria. In realtà il suo approccio è più ampio. La spannometria vera e propria - i problemi di Fermi - sono solo verso la fine, mentre nelle sezioni iniziali del libro Eastaway me......more

Goodreads review by Robert on April 10, 2021

Rob Eastaway has authored a clever little book with lots of practical ways for performing estimations off the cuff (or on the back of an envelope as the title describes it). I really enjoyed this book with handy tools for making quick estimations and good anecdotal stories to show some uses, explain......more

Quotes

‘A delightfully accessible guide to how to play with numbers’ – Dr Hannah Fry, author of and ‘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 ‘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’ –

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