Brief introduction to the content of abacus problem set

The main contents of Abacus Problem Set (Third Edition) are as follows:

1. abacus exercise set (third edition) adds some theoretical thinking questions to each unit to combine theory with practical operation.

2. The abacus exercise set (the third edition) arranges the actual simulated test questions for the abacus grade assessment, which combines the practice in teaching with the abacus grade assessment. 3. The units in the abacus exercise set (3rd edition) are arranged in the matching order with the unified textbook "Abacus Course", so as to make every effort to learn and do the same. This abacus exercise set (3rd edition) is more scientific, practical and novel.