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Product Description: These 10-minute activities help students develop a sense of what numbers represent and how to use them by, exploring relationships and patterns, encouraging mental computation, recognizing equivalent representations of a number, establishing benchmarks, improving estimation skills, and exploring the idea of reasonableness...read more (view table of contents, read Amazon.com's description)

Product Description: This four-book series is designed to promote thinking and reflection about numbers, leading students to develop a strong foundation in number sense. Students in primary through middle grades will explore patterns, develop mental-computation skills, understand different but equivalent representations, establish benchmarks, recognize reasonableness, and acquire estimation skills...read more (view table of contents, read Amazon.com's description)

Product Description: Book by Reys, Barbara

Product Description: 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...read more