Radicem extrahere pars septima dicitur esse.
The Seven Rules of Arithmetic.
The seven rules. ¶ Here telles þat þer beɳ .7. spices or partes of þis craft. The first is called addicioñ, þe secunde is called subtraccioñ. The thryd is called [duplacioñ]. The 4. is called [dimydicioñ]. The 5. is called multiplicacioñ. The 6 is called diuisioñ. The 7. is called extraccioñ of þe [Rote]. What all þese spices bene hit schalle be tolde singillatim in [here] [caputule].
¶ Subtrahis aut addis a dextris vel mediabis:
Add, subtract, or halve, from right to left. Thou schal be-gynne in þe ryght side of þe boke or of a tabul. loke were þou wul be-gynne to write latyn or englys in a boke, & þat schalle be called þe lyft side of the boke, þat þou writest toward þat side schal be called þe ryght side of þe boke. Versus.
A leua dupla, diuide, multiplica.
Here he telles þe in quych side of þe boke or of þe tabul þou schalle be-gyne to wyrch duplacioñ, diuisioñ, and multiplicacioñ. Multiply or divide from left to right. Thou schal begyne to [worch] in þe lyft side of þe boke or of þe tabul, but yn what wyse þou schal wyrch in hym dicetur [singillatim] in sequentibus capitulis et de vtilitate cuiuslibet artis & sic Completur leaf 140. *prohemium & sequitur tractatus & primo de arte addicionis que prima ars est in ordine.
The Craft of Addition.
Addere si numero numerum vis, ordine tali
Incipe; scribe duas primo series numerorum