{"product_id":"9781542357227","title":"Imaginary Abacus - Workbook: 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. This workbook has 1882 problems with answers. Example: Learn to calculate 415-350+233-155+44 quickly, just by imagining an abacus.\u003cp\u003eTo follow this course you will also need:\u003cbr\u003e1) A Japanese abacus (with at least 13 columns).\u003cbr\u003e2)The accompanying Instruction book 'Imaginary Abacus - Instruction book' (sold separately).\u003c\/p\u003e\u003cp\u003eClearly written with graphics. Answers to all work is included.\u003cbr\u003eLearning to use an abacus is both enjoyable and helps to improve concentration and memory power. Clearly written with graphics. Answers to all work is included. Learning to use an abacus is both enjoyable and helps to improve concentration and memory power.\u003c\/p\u003e","brand":"On Demand Publishing, LLC-Create Space","offers":[{"title":"Default Title","offer_id":47065184698608,"sku":"9781542357227","price":14.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781542357227_p0.jpg?v=1763750147","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781542357227","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}