Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator
by Edward H. Julius
Jossey-Bass; Published: 1995-06; Paperback; Book
Best price: $7.73
Price in other shops: $14.95

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Melissa & Doug Classic Wooden Abacus
Melissa and Doug; Melissa & Doug; Toy
Best price: $8.99
Price in other shops: $14.99

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Mental Math, Soroban Abacus Math, & Free Learning Via Computer
MathSecret; MathSecret; Toy
Best price: $9.99

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Short-Cut Math
by Gerard W. Kelly
Dover Publications; Published: 1984-04-01; Paperback; Book
Best price: $1.08
Price in other shops: $3.95

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Vintage Chinese Wooden Bead Arithmetic Abacus W. Storage Compartments
MZO; Asian Home; Kitchen
Best price: $29.99

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How To Use A Chinese Abacus: A step-by-step guide to addition, subtraction, multiplication, division, roots and more.
by Mr Paul Green
CreateSpace; Published: 2009-06-13; Paperback; Book
Best price: $24.84
Price in other shops: $28.95

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The Abacus: The World's First Computing System: Where it Comes From, How it Works, and How to Use it to Perform Mathermatical Feats Great and Small
by Jesse Dilson
St. Martin's Griffin; Published: 1995-03-15; Paperback; Book
Best price: $4.78
Price in other shops: $18.99

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Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
by Arthur Benjamin, Michael Shermer
Three Rivers Press; Published: 2006-08-08; Paperback; Book
Best price: $7.24
Price in other shops: $13.00

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The Complete Book of Fingermath: Simple, Accurate,Scientific
by Edwin M. Lieberthal
McGraw-Hill Companies; Published: 1983-10; Hardcover; Book
Best price: $36.00

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HOW TO USE A CHINESE ABACUS: A step-by-step guide to addition, subtraction, multiplication, division, roots and more
by PAUL GREEN
Lulu.com; Published: 2007-08-09; Paperback; Book
Best price: $20.06
Price in other shops: $27.95