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,...
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Learn to add and subtract in your head by imagining an abacus to calculate the result. Example: Learn to calculate 415-350+233-155+44 quickly, just by imagining an abacus. This book...
Подробно
This book will teach you step-by-step how to perform addition and subtraction on a Japanese abacus. Clearly explained with text and colored pictures throughout every stage of your calculation...
Подробно
This book will teach you step-by-step how to perform addition, subtraction, division, multiplication, square roots and practical examples on a Japanese abacus. Great for both children...
Подробно
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