To expand search, see Medieval Europe. Laterally related topics: Leonardo of Pisa (Fibonacci), Gerbert, Pope Sylvester II, The Liberal Arts, Sacrobosco (John of Holywood), Nicole Oresme, Hungary in the Middle Ages, De Vetula, England in the Middle Ages, and France in the Middle Ages.
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Sleight, E. R. The Craft of Nombrynge. Mathematics Teacher 32 (1939), 243--48.
As we are told, The Craft of Nombrynge is based on the Canto de Algorismo by Alexander de Villa Dei (1220). It explains how to add, subtract, double, and divide by two, but does not discuss general division or the extraction of roots. (The method of multiplication is essentially the galley method.) Topics are introduced from the Latin Canto, and the remaining text is given in English. Arithmetic (algorism) is attributed to a supposed King Algor of India. Reprinted in Swetz, Frank J., From Five Fingers to Infinity. Closely related topics: Arithmetic, The Extraction of Roots, and England in the 1400s.