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Carpenter, T. P., & Moser, J. M. (1982). The Development of Addition and Subtraction Problem-Solving Skills. In T. P. Carpenter, J. M. Moser, & T. A. Romberg (Eds.), Addition and Subtraction: A Cognitive Perspective (pp. 9-24). Hillsdale, NJ: Lawrence Erlbaurn Associates.

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