The grounde of artes : teaching the perfecte vvorke and practise of arithmetike, both in whole nu[m]bers and fractions, after a more easie and exact sort, than hitherto hath bene set forth. Made by M. Robert Recorde, D. in Physick, and afterwards augmented by M. Iohn Dee. And now lately diligently corrected, [and] beautified with some newe rules and necessarie additions: and further endowed with a thirde part, of rules of practize, abridged into a briefer methode than hitherto hath bene published: with diverse such necessary rules, as are incident to the trade of merchandize. Whervnto are also added diuers tables [and] instructions ... By Iohn Mellis of Southwark, scholemaster.