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paperback. Zustand: New. Paperback. Pub Date :2014-06-01 Pages: 92 Language: Chinese Publisher: Beijing Publishing House. I count 1st practice mental arithmetic: addition and subtraction within 100 vertical around 5-7 years old children must master during the school readiness The port operator mental arithmetic ability to write. but for young children will face primary entrance features. centralized in the book exercises. According to different themes. each book nearly 50 single page. each unit with timing training m.