Science Enhanced S&S Biology - Virginia Department of ...

Carpenter, T. and Moser, J. (1984) ‘The Acquisition of Addition and Subtraction Concepts in Grades One through Three’, Journal for Research in Mathematics Education, 15, 179-202. Fuson, K. (1982) ‘An Analysis of the Counting-On Procedure’ in T. Carpenter, J. Moser, and T. Romberg (eds.) Addition and-Subtraction’ A Cognitive ... ................
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