Algorithms; Arithmetic -- Early works to 1900; Mathematics -- History
¶ Postea p{ro}cedas hac condic{i}one secu{n}da:
Imp{ar} si fu{er}it hinc vnu{m} deme p{ri}ori,
Inscribens quinque, nam denos significabit
Monos p{re}d{ict}am.
[Sidenote: What to do if any other figure is odd. Write a figure of
five over the next lower number’s head. Example.]
¶ Her{e} he putt{es} þe fourte case, þe quych is þis. yf it happeɳ the
secunde figur{e} betoken odde nombre, þou schal do away on of þat odde
nombre, þe quych is significatiue by þ{a}t figure 1. þe quych 1 schall
be rekende for 10. Whan þ{o}u hast take away þ{a}t 1 out of þe nombre
þ{a}t is signifiede by þat figur{e}, þ{o}u schalt medie þ{a}t þat leues
ou{er}, & do away þat figur{e} þat is medied, & sette in his styde halfe
of þ{a}t nombre. ¶ Whan þ{o}u hase so done, þ{o}u schalt write [*leaf
150b] a figure of 5 ou{er} þe next figur{es} hede by-for{e} toward þe
ryȝt side, for þat 1, þe quych made odd nombr{e}, schall stonde for ten,
& 5 is halfe of 10; so þ{o}u most write 5 for his haluendell{e}. lo an
Ensampull{e}, 4678. begyɳ in þe ryȝt side as þ{o}u most nedes. medie 8.
þen þ{o}u schalt leue 4. do away þat 8 & sette þ{ere} 4. þen out of 7.
take away 1. þe quych makes odde, & sett 5. vpon þe next figur{es} hede
afor{e} toward þe ryȝt side, þe quych is now 4. but afor{e} it was 8.
for þat 1 schal be rekenet for 10, of þe quych 10, 5 is halfe, as þou
knowest wel. Whan þ{o}u hast þus ydo, medye þ{a}t þe quych leues aft{er}
þe takying{e} away of þat þat is odde, þe quych leuyng{e} schall{e} be
3; do away 6 & sette þ{er}e 3, & þou schalt haue such a nombre
5
4634.
aft{er} go forth to þe next fig{ur}e, & medy þat, & worch forth, for it
is lyȝt ynovȝt to þe c{er}tayɳ.
¶ Si v{er}o s{e}c{un}da dat vnu{m}.
Illa deleta, sc{ri}bat{ur} cifra; p{ri}ori
¶ Tradendo quinque pro denario mediato;
Nec cifra sc{ri}batur, nisi dei{n}de fig{ur}a seq{u}at{ur}:
Postea p{ro}cedas reliq{ua}s mediando figuras
Vt sup{ra} docui, si sint tibi mille figure.
[Sidenote: If the second figure is one, put a cipher, and write
five over the next figure. How to halve fourteen.]
¶ Her{e} he putt{es} þe 5 case, þe quych is [*leaf 151a] þis: yf þe
secunde figur{e} be of 1, as þis is here 12, þou schalt do away þat 1 &
sett þ{ere} a cifer. & sett 5 ou{er} þe next fig{ur}e hede afor{e}
toward þe riȝt side, as þou diddyst afor{e}; & þat 5 schal be haldel of
þat 1, þe quych 1 is rekent for 10. lo an Ensampull{e}, 214. medye 4.
þ{a}t schall{e} be 2. do away 4 & sett þ{ere} 2. þe{n} go forth to þe
next figur{e}. þe quych is bot 1. do away þat 1. & sett þ{ere} a cifer.
& set 5 vpon þe figur{es} hed afor{e}, þe quych is nowe 2, & þen þou
schalt haue þis no{m}b{re}
5
202,
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