Primam sub prima recte ponendo figuram,
Et sic de reliquis facias, si sint tibi plures.
Four things must be known: ¶ Here by-gynnes þe craft of Addicioñ. In þis craft þou most knowe foure thynges. ¶ Fyrst þou most know what is addicioñ. Next þou most know how mony rewles of figurys þou most haue. ¶ Next þou most know how mony diuers casys happes in þis craft of addicioñ. ¶ And next qwat is þe profet of þis craft. what it is; ¶ As for þe first þou most know þat addicioñ is a [castyng] to-gedur of twoo nomburys in-to one nombre. As yf I aske qwat is [twene] & thre. Þou wyl [cast] þese twene nombres to-gedur & say þat it is fyue. how many rows of figures; ¶ As for þe secunde þou most know þat þou schalle haue tweyne rewes of figures, one vndur a-nother, as here þou mayst se. 1234
2168. how many cases; ¶ As for þe thryd þou most know þat there ben foure diuerse cases. what is its result. As for þe forthe þou most know þat þe profet of þis craft is to telle what is þe hole nombur þat comes of diuerse nomburis. Now as to þe texte of oure verse, he teches there how þou schal [worch] in þis craft. ¶ He says yf þou wilt cast one nombur to anoþer nombur, þou most by-gynne on þis wyse. How to set down the sum. ¶ ffyrst write leaf 140 b. *two rewes of figuris & nombris so þat þou write þe first figure of þe hyer nombur euene vndir the first figure of þe nether nombur, 123
234. And þe secunde of þe nether nombur euene vndir þe secunde of þe hyer, & so forthe of euery figure of both þe rewes as þou mayst se.
The Cases of the Craft of Addition.
¶ Inde duas adde primas hac condicione:
Si digitus crescat ex addicione priorum;
Primo scribe loco digitum, quicunque sit ille.
¶ Here he teches what þou schalt do when þou hast write too rewes of figuris [on] vnder an-oþer, as I sayd be-fore. Add the first figures; ¶ He says þou schalt take þe first figure of þe heyer nombre & þe fyrst figure of þe neþer nombre, & cast hem to-geder vp-on þis condicioɳ. Thou schal loke qweþer þe nomber þat comys þere-of be a digit or no. rub out the top figure; ¶ If he be a digit þou schalt do away þe first figure of þe hyer nombre, and write þere in his stede þat he stode Inne þe digit, þat comes of þe ylke 2 figures, & so write the result in its place. [wrich] forth oɳ oþer figures yf þere be ony moo, til þou come to þe ende toward þe lyft side. And [lede] þe nether figure stonde still euer-more til þou haue [ydo]. ffor þere-by þou schal [wyte] wheþer þou hast done wel or no, as I schal tell þe afterward in þe ende of þis Chapter. ¶ And loke [allgate] leaf 141 a. þat þou be-gynne to worch in þis Craft of Addi*cioɳ in þe ryȝt side, Here is an example. here is an ensampul of þis case. 1234
2142. Caste 2 to foure & þat wel be sex, do away 4. & write in þe same place þe figure of sex. ¶ And lete þe figure of 2 in þe nether rewe stonde stil. When þou hast do so, cast 3 & 4 to-gedur and þat wel be seuen þat is a digit. Do away þe 3, & set þere seueɳ, and lete þe neþer figure stonde stille, & so [worch] forth bakward til þou hast [ydo] all to-geder.
Et si compositus, in limite scribe sequente
Articulum, primo digitum; quia sic iubet ordo.