Take 4 out of 2. it wel not be. borow 1 out of be next figure significatyf, þe quych is 4, & þen leues 3. do away þ{a}t figur{e} of 4 & write þ{ere} 3. & sett þ{a}t 1 vppon þe fig{ur}e of 2 hede, & þan take 4 out of ten, & þan þere leues 6. Cast 6 to the fig{ur}e of 2, þ{a}t wol be 8. do away þat 6 & write þ{er}e 8. Whan þ{o}u hast þus y-do make of eu{er}y 0 betweyn 3 & 8 a figure of 9, & þan worch forth in goddes name. & yf þ{o}u hast wel y-do þ{o}u[{5}] schalt haue þis nomb{er} +-----+ |39998| Sic. |10004| +-----+ [Headnote: How to prove the Subtraction.] ¶ Si subt{ra}cc{i}o sit b{e}n{e} facta p{ro}bar{e} valebis Quas s{u}btraxisti p{ri}mas addendo figuras. [Sidenote: How to prove a subtraction sum. Here is an example. He works his proof through, and brings out a result.] ¶ Her{e} he teches þe Craft how þ{o}u schalt know, whan þ{o}u hast subt{ra}yd, wheþ{er} þou hast wel ydo or no. And þe Craft is þis, ryght as þ{o}u subtrayd þe neþ{er} figures fro þe hier figures, ryȝt so adde þe same neþ{er} figures to þe hier figures. And yf þ{o}u haue well y-wroth a-for{e} þou schalt haue þe hier nombre þe same þ{o}u haddest or þou be-gan to worch. as for þis I bade þou schulde kepe þe neþ{er} figures stylle. lo an [*leaf 145b] Ensampull{e} of all{e} þe 4 cases toged{re}. worche well{e} þis case +--------+ |40003468|. |20004664| +--------+ And yf þou worch well{e} whan þou hast all{e} subtrayd þe þ{a}t hier nombr{e} her{e}, þis schall{e} be þe nombre here foloyng whan þ{o}u hast subtrayd. +--------+ |39998804|. [Sidenote: Our author makes a slip here (3 for 1).] |20004664| +--------+