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Author: Editor-In-Chief Sun Mingde

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Abacus Technology Editor-In-Chief Sun Mingdecompleted The book is divided into five items, namely basic knowledge of abacus, addition and subtraction of abacus, multiplication of abacus, division of abacus and simple mental arithmetic, and is accompanied by abacus technical grade identification standards. This book also comes with an electronic teaching reference package (including teaching guides, electronic lesson plans and answers to exercises), see the preface for details. —Reads8.5Score—Shelves