Abacus Mind Math Level 3 Workbook 1 of 2: Excel at Mind Math with Soroban, a Japanese Abacus (Abacus Mind Math - Level - 3 Complete Set: Instruction Book, Workbook 1 of 2, Workbook 2 of 2)
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There is Answer Key which is a great help for a parent
These books are a gem. Provides lots of practice. There is Answer Key which is a great help for a parent.
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