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Teaching children simple abacus and mental arithmetic (Vol.1)(Chinese Edition)
Seller: liu xing, Nanjing, JS, China
Seller rating 5 out of 5 stars
paperback. Condition: New. Paperback. Pub Date: 2017-02-01 Pages: 125 Language: Chinese Publisher: Hefei University Press abacus. abacus is a type of short mental arithmetic. also known as Pearl brain speed calculation. it is the digital counting beads become symbols come human mind. and a style of computing abacus arithmetic operations based on the principle that it is not only fast computing capabilities . Seller Inventory # NP011988