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Learn to add and subtract in your head by imagining an Abacus to calculate the result.
This. 2) The accompanying workbook \'Imaginary Abacus - Workbook\' (sold separately).
To follow this book you will need: 1) A Japanese Abacus (with at least 13 columns).
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).
Learn to add and subtract in your head by imagining an Abacus to calculate the result
Uneori, aceste descrieri pot contine inadvertente. De asemenea, imaginea este informativa si poate contine accesorii neincluse in pachetele standard.
