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

By Paul Green
Paperback
$16.22
By Paul Green
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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. 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 included. Learning to use an abacus is ...

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