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Book Description paperback. Condition: New. Paperback. Pub Date: November 2012 Pages: 140 Language: Chinese in Publisher: Jilin University Press mental arithmetic. port operators quick calculation. a simple calculation. New thinking. mouth computational problems Card: Mathematics (Grade 4) (RJB) 10 minutes. improve operational capacity. strengthen the oral calculation speed! Contents: four arithmetic sibling mixed arithmetic four mixed computing practice one containing brackets of four op about 0 of the arithmetic exercises twenty-two. Seller Inventory # NG005518