Cocker's Arithmetick: being a plain and familiar method suitable to the meanest capacity, for the full understanding of that incomparable art, as it is now taught by the ablest school-masters in city and country ... / By Edward Cocker, late practicioner [!] in the arts of writing, artihmetick, and engraving. Being that so long since promised to the world. Perused and published by John Hawkins, writing-master near St. George's church in Southwark, by the author's correct copy, and recommended to the world by many eminent mathematicians and writing-masters in and near London.

Edward Cocker

Date:: 1697

Credit: Cocker's Arithmetick: being a plain and familiar method suitable to the meanest capacity, for the full understanding of that incomparable art, as it is now taught by the ablest school-masters in city and country ... / By Edward Cocker, late practicioner [!] in the arts of writing, artihmetick, and engraving. Being that so long since promised to the world. Perused and published by John Hawkins, writing-master near St. George's church in Southwark, by the author's correct copy, and recommended to the world by many eminent mathematicians and writing-masters in and near London. Source: Wellcome Collection.

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$sienap. 32. Donble Pofitiox. 243 ity, fd there remaineth 168 for a Dividend, then f 4h. Boftrak 20, ( the lefler Error) from 32 (the greater “irrory and che Remainder is 12, for a Divifor, then ywoglivide 168 by 12, and the Quotient is 14 for the An- 4,,\anver, which is the fhareof A inthe Payment, \ 6. Again Secondly, If the errors had beer both too Hig ic had had the fame effect, as appeareth by the gpHowing work; for firft I fuppofe A paid 20 /. then wisp paid gol. andC. s0/. which inallis 100, butic “ @hould have been no more than 76, wherefore the irft Error is 24 too much, Again, I fuppofe A paid #82. then B muft pay 282. and C. muit pay 46 /. ) Which in all a » Ro A A 13 “Rho B B 28 ~ ito C 20 112 432 C 46 4 20° 18 tio fum By (14 facit fam 92 76 fubtr. 24 16 Subtr. 76 “ 8 ‘Weg error error 16 | Ns 92 1. but it Mhould have been but 962. wherefore “Mthe fecond Error is 16 too much 5 then T multiply ME ( the firft Pofition). by 16 (the fecond Error) and ohe produ is 320, again I multiply 18, the (fecond WP ofttion ) by 24 (the firft Error) and the produGis 432. | fi hen becaufe the Errors are both too much, I fubfiract 8b 20 (the leffer product) from 432 (the greater pro- i iftiuct, )and there remainech 112 for a Dividend, likewife “EN fubftrat (16 the leffer Error) (from 24 the greater. GME rror,) and che difference is 8 for a Divifor, then peta iGForm Divifion, and the Quotient is 14, (as before) w/AFor the an{wer. 9] Again Thirdly, If the Errors had been the one too ip ibig, and the other too little, Refpect being had to the sth Rule foregoing, the Anfwer would have MMbeen the fame; as thus, I ‘take for my firft Pof- nition 6, and then the Error is 32 roo litle, then I i take$

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