Author: None
Publisher:
Publishing Time: None
Features: This book includes three parts: Theory of Abacus, Abacus Techniques, and Mental Abacus Techniques. It provides guidance, practicality, and operability for learning this skill, supplemented by specific exercises. Appendix: Grading and Rank Standards for Abacus and Mental Abacus Calculation.
New Computing Technology Abacus and Mental Abacus
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