Graham A. Jones, Carol A. Thornton, Ian J. Putt, Kevin M. Hill, A. Timothy Mogill, Beverly S. Rich, Laura R. Van Zoest, Multidigit Number Sense: A Framework for Instruction and Assessment, Journal for Research in Mathematics Education, Vol. 27, No. 3 (May, 1996), pp. 310-336
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Jones et al. (1996) studied this question.
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