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This paper looks at how calculations were performed without using pen and paper in the period before all had adopted Hindu-Arabic numerals and written approaches to calculation.

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This page is a summary of: The medieval counting table revisited: a brief introduction and description of its use during the early modern period, BSHM Bulletin Journal of the British Society for the History of Mathematics, November 2014, Taylor & Francis,
DOI: 10.1080/17498430.2014.917392.
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