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

subtraction

by Mr. Paul Green

Paperback

details (United States).

ISBN: 978-1-9780-4349-7

ISBN-10: 1-9780-4349-X

CreateSpace Independent Publishing Platform · 2017