Play "mind games" in the classroom with 36 reproducible lessons that make it easy for students to add, subtract, multiply, and divide in their heads! Power Builder practice sets, step-by-step teaching notes and transparency masters, answers, progress tests, and "Mental Athlete" anecdotes make this a fun way to teach math computation. Grades 4-6

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Founded in 2002, World of Books is a leading online destination for buying and selling both preloved and new books, committed to making sustainable reading accessible to all. With a mission to help people read more and waste less, World of Books offers a huge range of affordable, high-quality books ? giving both new and preloved titles a second life. The company also operates World of Books ? Sell Your Books, an easy-to-use platform that allows customers to trade in unwanted books for cash, helping to keep books in circulation while promoting sustainability. As a Certified B Corp, World of Books is driven by a vision to become the world?s largest and most sustainable dedicated online bookstore. The company measures its success through the positive environmental impact it creates, the value it provides to customers, and its ability to operate profitably while supporting its sustainable mission

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