{"product_id":"9780008324605_maths-on-the-back-of-an-envelope-clever-ways-to-roughly-calculate-anything","title":"Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything","description":"\u003cp\u003e\n          \u003cstrong\u003e‘Another terrific book by Rob Eastaway’ SIMON SINGH\u003c\/strong\u003e\n        \u003c\/p\u003e\u003cp\u003e\n          \u003cstrong\u003e‘A delightfully accessible guide to how to play with numbers’ HANNAH FRY\u003c\/strong\u003e\n        \u003c\/p\u003e\u003cp\u003eHow many cats are there in the world?\u003c\/p\u003e\u003cp\u003eWhat's the chance of winning the lottery twice?\u003c\/p\u003e\u003cp\u003eAnd just how long does it take to count to a million?\u003c\/p\u003e\u003cp\u003eLearn how to tackle tricky maths problems with nothing but the back of an envelope, a pencil and some good old-fashioned brain power.\u003c\/p\u003e\u003cp\u003eJoin 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, \u003cem\u003eMaths on the Back of an Envelope\u003c\/em\u003e 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.\u003c\/p\u003e\u003cp\u003eIn Maths on the Back of an Envelope, Rob Eastaway combines the philosophy and history of mathematics with practical teaching methods. Through a series of games and activities, he makes the study of arithmetic and computational mathematics both accessible and fun.\u003c\/p\u003e\u003cp\u003eFor fans of New Scientist (Why the Universe Exists), Timothy Revell (Man vs Maths), Kate Kitagawa (The Secret Lives of Numbers), Alex Bellos (Alex's Adventures in Numberland), and Ian Stewart (The Science of Discworld IV).\u003c\/p\u003e","brand":"Rob Eastaway, Read by Rob Eastaway","offers":[{"title":"Default Title","offer_id":46889489531029,"sku":"9780008324605","price":19.99,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0484\/3175\/9509\/files\/9780008324605.jpg?v=1776888587","url":"https:\/\/harpercollins.com.au\/products\/9780008324605_maths-on-the-back-of-an-envelope-clever-ways-to-roughly-calculate-anything","provider":"HarperCollins AU","version":"1.0","type":"link"}