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Maths on the Back of an Envelope

Clever ways to (roughly) calculate anything

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Maths on the Back of an Envelope

By: Rob Eastaway
Narrated by: Rob Eastaway
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About this listen

‘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.

©2019 Rob Eastaway (P)2019 HarperCollins Publishers Limited Mathematics

Critic Reviews

"A delightfully accessible guide to how to play with numbers." (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 David Spiegelhalter, author of The Art of Statistics)

"Another terrific book by Rob Eastaway." (Simon Singh)

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Profile Image for alazhar

Expect to find clever ways? Expect away!

Unless you're terrible in arithmetic or simple calculations, then this books is probably not for you. Having said that, there are a few estimating tricks I personally benefited from.

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