The most popular English arithmetic of the 16th century was Robert Recorde’s Ground of Artes. Of the many surviving editions (15 before 1600), only two were published during Recorde’s lifetime, and a third was published shortly after his death. The first two differ materially from the latter, which was the basis of the long series of „augmented“ or „revised“ editions which appeared from 1561 to 1699. Because of their greater accessibility, discussions of 16th-century arithmetics usually cite these later editions, sometimes (...) tacitly ascribing material to the early editions which does not appear before 1558. (shrink)