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Imaginary Abacus - Workbook: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban). Jimmy Patterson young couples in ParisLearn 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. To follow this course you will also need: 1) A Japanese abacus (with at least 13 columns). 2)The accompanying Instruction book 'Imaginary Abacus Instruction book' (sold separately). Clearly written with graphics. Answers to all work is
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