"Such a pleasure. A unique and wonderful book!" Imre Leader, Professor of Pure Mathematics, University of Cambridge.

Ashley starts listing numbers 1, 2, 3, 4, 6, 8, 9, 10, ..., missing out every number containing a digit 5 or 7. What is the 1000th number in his list?

This is not an ordinary puzzle book. Beautifully crafted and immensely enjoyable, the problems require minimal technical knowledge, being accessible to young secondary school pupils. However, there is an astonishing range in difficulty; while some of the problems are fairly straightforward, others are significantly tougher, with a great deal of ingenuity and clarity of thought needed to make progress.

Whether you are

a student preparing for a maths competition,
an educational establishment seeking to supplement your problem solving resources, or
an individual looking for a different sort of challenge,

Elastic Numbers is a unique collection, and will push you to the very edge of your abilities.

About the Author

Daniel Griller is an educator and problem creator. Having read mathematics at Trinity College, Cambridge, he now teaches the subject at a school in the UK. He has coached teams of pupils to two successive national titles at the FMSP/UKMT Senior Team Maths Challenge and a Hans Woyda Maths Competition crown. An experienced puzzle designer, his inventions have appeared in multiple national competitions, including the British Maths Olympiad, the Senior Maths Challenge and the Intermediate Maths Olympiad.

"About this title" may belong to another edition of this title.

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In 2002, World of Books Group was founded on an ethos to do good, protect the planet and support charities by enabling more goods to be reused. Since then, we've grown into to a global company pioneering the circular economy. Today, we drive the circular economy through three re-commerce brands: - Wob: Through Wob, we sell. We provide affordable, preloved books and media to customers all over the world. A book leaves our collection of over seven million titles and begins a new chapter every two seconds, enabling more goods to be reused. - Ziffit: Through Ziffit, we buy. We give people around the world the opportunity to contribute to the circular economy, earn money and protect the planet, by trading their unwanted books and media. - Shopiago: Through Shopiago, we help others. By sharing the technology that has grown World of Books Group into the business it is today, we?re helping charities increase revenue and reduce waste through re-commerce.

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