Advanced Abacus: Theory and Practice

This volume is designed for the student desiring a greater understanding of the abacus and its calculative functions.

The text provides thorough explanations of the advanced operations involving negative numbers, decimals, different units of measurement, and square roots.

Diagrams illustrate bead manipulation, and numerous exercises provide ample practice.

Concise and easy-to-follow, this book will improve your abacus skills and help you perform calculations with greater efficiency and precision.