Imaginary Abacus - Instruction Book: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban). AUTH-11313158 She's the Chief of Staff

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Imaginary Abacus - Instruction Book: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban). AUTH-11313158 She's the Chief of StaffLearn 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