Download E-books Calculator's Cunning: The Art of Quick Reckoning (Science & Discovery) PDF

By Karl Menninger

Desk of Contents
Title Page
Calculator's crafty: The paintings of fast Reckoning
Foreword
Preface
Translator's Note
Contents
Abbreviations
Introduction
I: trying out a Calculation
II: units for the 4 Operations, or Arithmetical Tricks
III: Estimates
IV: Percentages
Answers
Selected Bibliography
Index

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