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

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
• | Publisher: CreateSpace Independent Publishing Platform
• | Publication Date: Oct 15, 2017
• | Number of Pages: 100 pages
• | Language: English
• | Binding: Paperback
• | ISBN-10: 197804349X
• | ISBN-13: 9781978043497