RTI Tools : Mathematics : Number and Operations

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Illuminations: Web Links - Number & Operations Web links to resources for math: number and operations...
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Learning Math: Number and Operations A video- and Web-based course for K-8 teachers; 12 half-hour video programs (10 per grade band), course guide, and Web site; graduate credit available
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Seeing Math Elementary: Number & Operations: Broken Calculator In Number & Operations: Broken Calculator, students develop computational fluency by solving problems with a "broken" calculator. For example, a baker packs 315 buns into boxes of 8. How many boxes will the baker need? The division key is broken! Students must find ways to solve the problem, evaluate the solutions, and explain their reasoning.
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