The ground of artes : teaching the perfect worke and practise of arithmaticke, both in whole numbers and fractions, after a more easie and exact sort, than hitherto hath beene set foorth. Made by M. Robert Record, D. in Physicke. And now lately diligently corrected and beautified with sundry new rules and necessary additions: and further endowed with a third part, of rules of practise, abridged into a briefer method than hitherto hath bene published: with diuerse such necessarie rules as are incident to the trade of merchandise. Whereunto are also added diuerse tables and instructions ... By Iohn Mellis of Southwark, scholemaster.