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About the Brand

HARPERCOLLINS

Publishing great authors since 1817, HarperCollins is the second-largest consumer book publisher in the world. With 200 years of history and more than 120 branded imprints around the world with strengths in literary and commercial fiction, business books, children’s books, cookbooks, and mystery, romance, reference, religious, and spiritual books, HarperCollins publishes approximately 10,000 new books every year.

USBORNE

Usborne is one of the world’s leading independent book publishers. We are proud to be a family business that aims to create brilliant books for children of all ages.

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HarperCollins

Maths on the Back of an Envelope

  • SKU: 9780008444495
  • UPC: 9780008444495
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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.





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