Dexter James BoothDexter was educated in Wales and Canada being awarded a PhD in Theoretical Physics in 1970 by the University of Victoria in British Columbia. Since that time he has taught in a variety of institutions, finally retiring from the University of Huddersfield as a Principal Lecturer in 2007. His abiding interest in the teaching of mathematics has spurred him to produce over thirty books in mathematics, statistics and computing and this latest Think of a number . . . is his first venture into eBook publishing. It was inspired by a desire to expand his annual first lecture to his engineering students who were exposed to a rather wildly extravagant description of the place of numbers in the general scheme of things. The whole point of the book is to display the elements of the structure of the number system in a fairly unintimidating way. Whilst the approach is unconventional and not in the least bit rigorous it does expose Dexter’s approach to education in general - at least the students seemed to appreciate it.