Imaginary Abacus - Instruction book: A mind math step-by-step guide to addition and subtraction using an imaginary Japanese abacus (Soroban). (Paperback) (ISBN-13: 9781978043497)

Learn to add and subtract in your head by imagining an abacus to calculate the result. Example: Learn to calculate 415-350+233-155+44 quickly, just by imagining an abacus.This book will teach you the skills required to firstly use the actual abacus effectively, then how to use an imaginary abacus (also known as a mental abacus). To follow this book you will need: 1) A Japanese abacus (with at least 13 columns). 2) The accompanying workbook 'Imaginary Abacus - Workbook' (sold separately). This useful and impressive skill would be an asset for anyone.

Author: Paul Green
ISBN-10: 197804349X
ISBN-13: 9781978043497
Publisher: Createspace Independent Publishing Platform
Language: English
Published: 10/15/2017
Pages: 102
Format: Paperback
Weight: 0.57lbs
Size: 11.00h x 8.50w x 0.21d