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Strategies for solving addition and subtraction problems based on an understanding of numbers, number relationships, and the operations of addition and subtraction.

Putting Together and Taking Apart: Addition and Subtraction 1997, Dale Seymour Publications

ISBN-13: 9781572326576

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Putting Together and Taking Apart: Addition and Subtraction 1996, Dale Seymour Publications

ISBN-13: 9781572322189

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