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Book Description paperback. Condition: New. Paperback Pages Number: 70 Language: Simplified Chinese Publisher: Hunan Children's Publishing House; 1st edition (August 1. 2011). Mathematical exercise of pre-school children: the ladder mathematics classroom (3 years to improve articles) suitable for young children age of learning content. to understand simple addition and subtraction to increase the interest of the child to learn. interesting pictures. making the appropriate selection for the child's cognitive level of learning content st. Seller Inventory # M20388