{"product_id":"9781978043497","title":"Imaginary Abacus - Instruction Book: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban).","description":"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).\u003cp\u003eTo follow this book you will need:\u003c\/p\u003e\u003cp\u003e1) A Japanese abacus (with at least 13 columns).\u003cbr\u003e2) The accompanying workbook 'Imaginary Abacus - Workbook' (sold separately). \u003c\/p\u003e\u003cp\u003eThis useful and impressive skill would be an asset for anyone.\u003c\/p\u003e","brand":"On Demand Publishing, LLC-Create Space","offers":[{"title":"Default Title","offer_id":47062109126896,"sku":"9781978043497","price":19.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781978043497_p0.jpg?v=1763671015","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781978043497","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}