And þou schalt know þ{us}. adde þe neþ{er} rowe of þe same nombre to þe hier rewe as þus, cast 4 to 4. þat wol be 8. do away þe 4 & write þ{ere} 8. by þe first case of addicioɳ. þan cast 6 to 0 þat wol be 6. do away þe 0, & write þere 6. þan cast 6 to 8, þ{a}t wel be 14. do away 8 & write þ{ere} a fig{ur}e of 4, þat is þe digit, and write a fig{ur}e of 1. þ{a}t schall be-token ten. þ{a}t is þe articul vpon þe hed of 8 next aft{er}, þan reken þ{a}t 1. for 1. & cast it to 8. þat schal be 9. cast to þat 9 þe neþ{er} fig{ur}e vnd{er} þat þe quych is 4, & þat schall{e} be 13. do away þat 9 & sett þ{er}e 3, & sett a figure of 1. þ{a}t schall be 10 vpon þe next figur{is} hede þe quych is 9. by þe secu{n}de case þ{a}t þ{o}u hadest in addicioɳ. þan cast 1 to 9. & þat wol be 10. do away þe 9. & þat 1. And write þ{ere} a cifer. and write þe articull{e} þat is 1. betokenyng{e} 10. vpon þe hede of þe next figur{e} toward þe lyft side, þe quych [*leaf 146a] is 9, & so do forth tyl þ{o}u come to þe last 9. take þe figur{e} of þat 1. þe quych þ{o}u schalt fynde ou{er} þe hed of 9. & sett it ou{er} þe next figures hede þat schal be 3. ¶ Also do away þe 9. & set þ{ere} a cifer, & þen cast þat 1 þat stondes vpon þe hede of 3 to þe same 3, & þ{a}t schall{e} make 4, þen caste to þe ylke 4 the figur{e} in þe neyþ{er} rewe, þe quych is 2, and þat schall{e} be 6. And þen schal þ{o}u haue an Ensampull{e} aȝeyɳ, loke & se, & but þ{o}u haue þis same þ{o}u hase myse-wroȝt. +--------+ |60003468| |20004664| +--------+ Sequit{ur} de duplac{i}one [Headnote: The Craft of Duplation.] ++Si vis duplar{e} num{er}u{m}, sic i{n}cipe p{rim}o Scribe fig{ur}ar{um} serie{m} q{ua}mcu{n}q{ue} vel{is} tu. [Sidenote: Four things must be known in Duplation. Here they are. Mind where you begin. Remember your rules.]