Imaginary Abacus - Workbook: A mind math step-by-step guide to addition and subtraction using an imaginary Japanese abacus (Soroban).

by Paul Green

Learn to add and subtract in your head by imagining an abacus to calculate the result. This workbook has 1882 problems with answers. Example: Learn to calculate 415-350+233-155+44 quickly, just by... This description may be from another edition of this product.

• Format: Paperback
• Language: English
• ISBN: 1542357225
• ISBN13: 9781542357227
• Release Date: January 2017
• Publisher: Createspace Independent Publishing Platform
• Length: 124 Pages
• Weight: 0.67 lbs.
• Dimensions: 0.3" x 8.5" x 11.0"