Karl Menninger
Basic Books | 1964 | djvu | 1,53 Mb
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Descrição: An arithmetical trick is a device for solving a problem more easily and surprisingly than by ordinary methods. While one person will see behind it the broad and wonderfully intricate world of numbers, another will be satisfied by his delight in the trick itself. This book will serve both kinds of student. It will teach the beginner to master a series of useful methods and above all to look at the numbers before doing any calculation, in order to use the tricks appropriate to them; for the advanced student, and for anyone who enjoys numbers, it will afford many pleasant glimpses into the land of numbers, and stimulate him to a voyage of discovery.
Numbers have a certain magic. It is no accident that their wonderful properties have grown into the theory of numbers, 'the queen of mathematics'. Those relations which the schoolboy knows as arithmetical tricks belong to elementary number-theory.
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