SHARING SUBMARINE SANDWICHES: A CONTEXT FOR FRACTIONS, GRADES 5-8by Catherine Twomey Fosnot; Maarten Dolk; Antonia Cameron; Sherrin B. Hersch;WORKING WITH THE RATIO TABLE: MATHEMATICAL MODELS, GRADES 5-8by Catherine Twomey Fosnot; Maarten Dolk; Antonia Cameron; Sherrin B. Hersch; Bill Jacob

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