[Sidenote: Definition. How the numbers should be written. The method of working. Begin at the right. The Sum is a digit, or an article, or a composite.] Addicio{u}n is of nombre other of nombres vnto nombre or to nombres aggregacio{u}n, that me may see that that is come therof as exc{re}ssent. In addicio{u}n, 2. ordres of figures and .2. nombres ben necessary, that is to sey, a nombre to be added{e} and the nombre wherto the addic{i}oun shold{e} be made to. The nombre to be added{e} is that þat shold{e} be added{e} therto, and shall{e} be vnderwriten; the nombre vnto the which{e} addicio{u}n shall{e} be made to is that nombre that resceyueth{e} the addicion of þat other, and shall{e} be writen above; and it is convenient that the lesse nombre be vnderwrit, and the more added{e}, than the contrary. But whether it happ{e} one other other, the same comyth{e} of, Therfor, yf þow wilt adde nombre to nombre, write the nombre wherto the addicio{u}n shall{e} be made in the omest ordre by his differences, so that the first of the lower ordre be vndre the first of the omyst ordre, and so of others. That done, adde the first of the lower ordre to the first of the omyst ordre. And of such{e} addicio{u}n, other þ{er}e grow{i}t{h} therof a digit, An article, other a composed{e}. If it be digit{us}, In the place of the omyst shalt thow write the digit excrescyng, as thus:-- +----------------------------+---+ |The resultant | 2 | +----------------------------+---+ |To whom it shal be added{e} | 1 | +----------------------------+---+ |The nombre to be added{e} | 1 | +----------------------------+---+ If the article; in the place of the omyst put a-way by a cifre writte, and the digit transferred{e}, of þe which{e} the article toke his name, toward{e} the lift side, and be it added{e} to the next figure folowyng, yf ther be any figure folowyng; or no, and yf it be not, leve it [in the] void{e}, as thus:-- +---------------------------------+----+ | The resultant | 10 | +---------------------------------+----+ | To whom it shall{e} be added{e} | 7 | +---------------------------------+----+ | The nombre to be added{e} | 3 | +---------------------------------+----+ +----------------------+---+---+---+---+---+ | Resultans | 2 | 7 | 8 | 2 | 7 | +----------------------+---+---+---+---+---+ | Cui d{ebet} addi | 1 | 0 | 0 | 8 | 4 | +----------------------+---+---+---+---+---+ | Num{erus} addend{us} | 1 | 7 | 7 | 4 | 3 | +----------------------+---+---+---+---+---+ And yf it happe that the figure folowyng wherto the addicio{u}n shall{e} be made by [the cifre of] an article, it sette a-side; In his place write the [*Fol. 49b] [digit of the] Article as thus:--