The grounde of artes teaching the perfect vvorke and practise of arithmetike, both in whole nu[m]bers and fractions, after a more easie ane 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 new 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. Whereunto are also added diuers tables [and] instructions ... By Iohn Mellis of Southwark, scholemaster.

To reduce lb s and d fren. into lb s d ster.

To know how much 1256 lb 12 s 6 d fren. maketh in sterling money, multiplie the sum by 5, and diuide the producte by 7 and 6 at twice, and the last quotient shal be the thing required that is to say, 1256 lb 12 s 6 d ma∣keth 149 lb 11 s 11 d 4/7 sterling.

Example. 〈 math 〉〈 math 〉

An other Example. 〈 math 〉〈 math 〉

Note, that when any money is giuen by exchange at London for Roan at 71 d ½: or ra∣ther 71 1/7, for the crown of 50 s french, there is neyther gaine nor losse, for it is one mony for an other, accompting 8 lb 8 s French for 1 lb sterling So the Gyuer loseth the time of payment which is about 15 dayes, & hée that taketh it, hath gaine of the same.

They of Rean that putte sorth, or take mo∣ney by exchange for London, ought to haue like consideration.

Item, when any man giueth at London 64 d ⅓, or rather 64 d 2/7, to haue at one of the Faires of Lions a crowne de Marc, he that so giueth his mony, loseth the time, and he that taketh it, gaineth the same: for 62 d 2/7 is e∣quall in value to 45 s French. He that put∣teth or taketh money at Lions for London, ought to consider the same.

Item, when anye deliuer in Antwerpe 75 d, to receiue at Lions a crown of Marcke, hée that putteth it foorth, looseth the tyme, and hée that taketh it, gaineth the same: For 75 groates Flemish is equall in valewe to 45 s French.

Thus for this time I make an ende of the practise of exchaunge and the enstructions therevnto belonging, and according to my promise gratify such as are desirous to know the common coynes vsed for traffique a∣mong Merchauntes in these Cities follow∣ing: Here followeth a briefe declaration of their monies and y^e recknings and accompts of them.