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Book Description paperback. Condition: New. Ship out in 2 business day, And Fast shipping, Free Tracking number will be provided after the shipment.Pub Date :2013-04-01 Language: Chinese Publisher: Chengdu Times Press abacus abacus is to the principle of mental arithmetic . For children. abacus tangible . not boring abstraction indoctrination. can greatly stimulate the child's learning motivation. Abacus heart when the child must hand-eye linkage. the brain and nervous system continues to make the appropriate positive stimulus . which can greatly facilitate the child 's overall mental and physical growth .Four Satisfaction guaranteed,or money back. Seller Inventory # BR022247