M. Blundevile his exercises containing sixe treatises, the titles wherof are set down in the next printed page: which treatises are verie necessarie to be read and learned of all yoong gentlemen that haue not bene exercised in such disciplines, and yet are desirous to haue knowledge as well in cosmographie, astronomie, and geographie, as also in the arte of navigation ... To the furtherance of which arte of navigation, the said M. Blundevile speciallie wrote the said treatises and of meere good will doth dedicate the same to all the young gentlemen of this realme.

A like example of losse receiued by Shipwracke.

Thrée Marchants doe venture their goods in one Shippe, the goods of the first were worth 300. Crownes, the second 400. the third 500. there were as much goods cast out as was worth 100. Crownes, the question is how much euery one should loose according to his portion, here worke as before, and you shall finde that euery one shall loose so much as this figure following sheweth.

1200.—	100.—	300.—	25.
400.—	33. ⅓ which is 5. groats
500.—	41. ⅔ which is 10. groats
The cōmon diuisor which is the Som of the particular porti¦ōs added together.	the gene∣rall losse.	the particu∣lar portions.	euery mans seueral losse

Here to know whether the 3. seuerall losses doe make vp the generall losse, do thus, first adde the Integrums of the seuerall losses together, the Somme whereof will bee 99. whereunto if you adde the 2. Fractions which doe make one whole Crowne, the Somme will be 100. a number like vnto the generall losse.