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(JP¥680)
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+NT$64 Service fee
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さやか 断捨離中
5/5438
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A mental arithmetic training book for elementary school students, featuring problems that can be solved in 5 seconds. - Title: The Book That Allows Elementary School Students to Do Mental Arithmetic Up to 19x19 in Just One Day - Author: Kazuya Komatsu - Copies Sold: 1.21 million - Target Age: Elementary School Students - Features: A workbook with problems that can be solved in a flash in 5 seconds. Thank you for looking.
3 months ago