And [*leaf 142a] þan worch forth. But yf þ{ere} come no figure aft{er} þe cifre, write þe articul next hym in þe same rewe as here +---+ | 5 | | 5 | +---+ cast 5 to 5, and it wel be ten. do away 5. þat is þe hier 5. and write þ{ere} a cifre, & write aft{er} hym þe articul as þus +----+ | 1φ | | 5 | +----+ And þan þ{o}u hast done. ¶ Si tibi cifra sup{er}ueniens occurrerit, illa{m} Dele sup{er}posita{m}; fac illic scribe figura{m}, Postea procedas reliquas addendo figuras. [Sidenote: What to do when you have a cipher in the top row. An example of all the difficulties.] ¶ Her{e} he putt{es} þe fourt case, & it is þis, þat yf þ{ere} come a cifer in þe hier rewe, how þ{o}u schal do. þus þ{o}u schalt do. do away þe cifer, & sett þ{ere} þe digit þ{a}t comes of þe addiciou{n} as þus 1φφ84. 17743 In þis ensampul ben all{e} þe four{e} cases. Cast 3 to foure, þ{a}t wol be seueɳ. do away 4. & write þ{ere} seueɳ; þan cast 4 to þe figur{e} of 8. þ{a}t wel be 12. do away 8, & sett þ{ere} 2. þat is a digit, and sette þe articul of þe composit, þat is ten, vpon þe cifers hed, & reken it for hym selfe þat is on. þan cast on{e} to a cifer, & hit wull{e} be but on, for noȝt & on makes but on{e}. þan cast 7. þ{a}t stondes vnd{er} þat on to hym, & þat wel be 8. do away þe cifer & þat 1. & sette þ{ere} 8. þan go forthermor{e}. cast þe oþ{er} 7 to þe cifer þ{a}t stondes ou{er} hy{m}. þ{a}t wul be bot seuen, for þe cifer betokens noȝt. do away þe cifer & sette þ{ere} seueɳ, [*leaf 142b] & þen go forþ{er}mor{e} & cast 1 to 1, & þat wel be 2. do away þe hier 1, & sette þ{ere} 2. þan hast þ{o}u do. And yf þ{o}u haue wel ydo þis nomber þat is sett her{e}-aft{er} wel be þe nomber þat schall{e} aryse of all{e} þe addicioɳ as her{e} 27827. ¶ Sequi{tu}r alia sp{eci}es. [Headnote: The Craft of Subtraction.] ++A nu{mer}o num{er}u{m} si sit tibi demer{e} cura Scribe figurar{um} series, vt in addicione. [Sidenote: Four things to know about subtraction: the first; the second; the third; the fourth.]