"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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