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Appendix I: a Treatise on the Numeration of Algorism:

The Earliest Arithmetics in English · Robert Steele — chapter 3 of 3 · ~45 words · public domain

See Introduction and Glossary for ſ:f and þ:y errors

Appendix II: Carmen de Algorismo:

In this selection, errors that are not explained in footnotes were assumed to be typographic.

l. 99 Postea procedas [procdeas] l. 163 Articuli digitum post in digitum mixti duc [post iu]

The Earliest Arithmetics in English · The Wunder Library — complete classics, free to read, with narration.