Title: nothing explained, nothing learned
Product review: My daughter had to use this book at school. It is awful! Greatest Common Factor (GCF) and Least Common Multiple (LCM) are introduced purely "experientially", followed by problems that quickly involve large numbers and lots of factors. Prime Time does not explain how to find GCF and LCM or even how to check your answers. Furthermore, prime factoring is introduced after large number GCF and LCM problems. The book does not provide any counter-examples to explain why some approaches that a student might try "experientially" fail. The games are repetitive and require many computations, and there is no other motivation of the subject. In short, this book utterly fails to distill and explain the essence of the subject.
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