Algorithms; Arithmetic -- Early works to 1900; Mathematics -- History
_M._ Now if you wold proue Multiplycatio{n}, the surest way is by
Dyuision: therfore wyll I ouer passe it tyll I haue taught you y^e arte
of Diuision, whiche you shall worke thus. Fyrste sette downe the Diuisor
for feare of forgettynge, and then set the nomber that shalbe deuided,
at y^e ryghte syde, so farre from the diuisor, that the quotient may be
set betwene them: as for exa{m}ple: Yf 225 shepe cost 45 l’i. what dyd
euery shepe cost? To knowe this, I shulde diuide the hole summe, that is
45 l’i. by 225, but that can not be, therfore must I fyrste reduce that
45 l’i. into a lesser denomination, as into shyllynges: then I multiply
45 by 20, and it is 900, that summe shall I diuide by the no{m}ber of
[*126b] shepe, whiche is 225, these two nombers therfore I sette thus.
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| | o
--o-o--+-----+--o-o-o-o-----
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--o-o--+-----+--------------
o | |
-------+-----+--------------
Then begynne I at the hyghest lyne of the diuident, and seke how often I
may haue the diuisor therin, and that maye I do 4 tymes, then say I,
4 tymes 2 are 8, whyche yf I take from 9, there resteth but 1, thus
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-------+-----------+--------
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--o-o--+-----------+--o-----
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--o-o--+-----------+--------
o | |
-------+--o-o-o-o--+--------
And bycause I founde the diuisor 4 tymes in the diuidente, I haue set
(as you se) 4 in the myddle roume, which [*127a] is the place of the
quotient: but now must I take the reste of the diuisor as often out of
the remayner: therfore come I to the seconde lyne of the diuisor, sayeng
2 foure tymes make 8, take 8 from 10, {and} there resteth 2, thus.
----------+-----------+----------
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-||-------+-----------+----------
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-----o-o--+-----------+----------
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-----o-o--+-----------+--o-o-----
o | |
----------+--o-o-o-o--+----------
Then come I to the lowest nomber, which is 5, and multyply it 4 tymes,
so is it 20, that take I from 20, and there remayneth nothynge, so that
I se my quotient to be 4, whiche are in valewe shyllynges, for so was
the diuident: and therby I knowe, that yf 225 shepe dyd coste 45 l’i.
euery shepe coste 4 s.
_S._ This can I do, as you shall perceaue by this exa{m}ple: Yf 160
sowldyars do spende euery moneth 68 l’i. what spendeth eche man? Fyrst
[*127b] bycause I can not diuide the 68 by 160, therfore I wyll turne
the pou{n}des into pennes by multiplicacio{n}, so shall there be
16320 d’. Nowe muste I diuide this su{m}me by the nomber of sowldyars,
therfore I set the{m} i{n} order, thus.
Public-domain text, read in full here on John Shaqi.
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