Singapore Math - Primary Mathematics Mastery and Beyond 3B Winter Bottom while the relaxed-fit and round

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Singapore Math - Primary Mathematics Mastery and Beyond 3B Winter Bottom while the relaxed-fit and roundMastery & Beyond is a distributed practice workbook. It provides practice of essential math concepts at select points to help students make connections. While the Additional Practice is for daily use, Mastery and Beyond is intended to be used at key points in a chapter after multiple lessons. Note: Two books (A and B) for each grade correspond to the two halves of the school year. Answer key in back of book. Soft cover.