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ABACUS : Level 2 Big Friends & Combination -abacus for kids /+4100 arithmetic operations - japanese soroban abacus- guide to addition-subtraction and practical examples for kids
about book : abacus math- japanese abacus --soroban --level. 2 -- guide to addition-subtraction(big friends ( 10's complements, )- combination 5 &10 and practical examples for kids ----+4100 arithmetic operation ---+5 years
Kindle Edition
Published March 22, 2021
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