Imaginary Abacus - Workbook: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban). by Paul Green

Imaginary Abacus - Workbook: A Mind Math Step-By-Step Guide to Addition and Subtraction Using an Imaginary Japanese Abacus (Soroban).

Paul Green

124 pages • missing pub info (view editions)

nonfiction education mathematics
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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. To follow this course you wil...

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