Quick(er) Calculations: How to Add, Subtract, Multiply, Square, and Square Root More Swiftly

Preface
Introduction
Challenge
1:Arithmetical Advice
2:Speedier Sums and Subtractions
Interlude I: The Magic of 111,111
3:Accounting for Taste — Adding Columns Quickly
Interlude II: Checking, Check Digits, and Casting out Nines
4:Quicker Quotients and Pleasing Products — Multiply and Divide by Specific Numbers
Interlude III: Doomsday
5:Calculations with Constraints — Multiply and Divide by Numbers with Specific Properties
Interlude IV: Multicultural Multiplication
6:Super Powers — Calculate Squares, Square Roots, Cube Roots, and More
7:Close-Enough Calculations — Quick and Accurate Approximations
Interlude V: Approximating the Number of Space Aliens
8:Multiplying Irrationally
The Grand Finale
Further Reading
Appendix I: Calculating Doomsday
Appendix II: The Squares from 1 to 100

Trevor Lipscombe graduated with an undergraduate degree in theoretical physics from Queen Mary College, University of London, and then obtained a doctorate in theoretical physics from the University of Oxford. He is the author, with Alice Calaprice, of “Albert Einstein: A Biography,” and sole author of “The Physics of Rugby,” which was selected as one of the best ten physics books of 2009. He edited the critical edition of Saint John Henry Newman's novel “Loss and Gain.” Trevor was a postdoctoral researcher at the Levich Institute at the City College of New York, but has also worked in a homeless shelter, a physics journal, and three university presses. He remains fond of finding ways to present science-related materials simply.