[*121b.] and then is there 80, as well w^t those 4 counters, as yf I had set downe y^e other 4 also. Now do I take the 200 in the fyrste su{m}me, and adde them to the 400 in the seconde summe, and it maketh 600, therfore I take vp the 2 counters in the fyrste summe, and 3 of them in the seconde summe, and for them 5 I set 1 in y^e space aboue, thus. -----------|------------ | o -----------|--o--------- | o -X--o-o-o--|------------ | o -----------|--o--------- | o -----------|--o-o-o----- | -----------|--o--------- Then I take y^e 3000 in y^e fyrste su{m}me, vnto whiche there are none in the second summe agreynge, therfore I do onely remoue those 3 counters from the fyrste summe into the seconde, as here doth appere. ----|------------- | o ----|---o--------- | o -X--|---o-o-o----- | o ----|-o----------- | o ----|---o-o-o----- | ----|---o--------- [*122a.] And so you see the hole su{m}me, that amou{n}teth of the addytio{n} of 65436 with 3245 to be 6868[1]. And yf you haue marked these two exa{m}ples well, you nede no farther enstructio{n} in Addition of 2 only summes: but yf you haue more then two summes to adde, you may adde them thus. Fyrst adde two of them, and then adde the thyrde, and y^e fourth, or more yf there be so many: as yf I wolde adde 2679 with 4286 and 1391. Fyrste I adde the two fyrste summes thus. -------------|-----------|-------------- | | o -X--o-o------|--o-o-o-o--|--o----------- o | | o ----o--------|--o-o------|--o-o-o-o----- o | o | o ----o-o------|--o-o-o----|--o----------- o | o | o ----o-o-o-o--|--o--------|-------------- [*122b.] And then I adde the thyrde thereto thus. And so of more yf you haue them. -------------|-----------|------------ | o | o -X--o--------|--o--------|--o-o-o----- | o | ----o-o-o----|--o-o-o-o--|--o-o-o----- o | o | o ----o-o-o-o--|----o------|------------ | o | o ----o--------|-----------|--o--------- [Headnote: Subtraction on the Counting Board.] [Sidenote: Subtraction.] _S._ Nowe I thynke beste that you passe forth to Subtraction, except there be any wayes to examyn this maner of Addition, then I thynke that were good to be knowen nexte. _M._ There is the same profe here that is in the other Addition by the penne, I meane Subtraction, for that onely is a sure waye: but consyderynge that Subtraction must be fyrste knowen, I wyl fyrste teache you the arte of Subtraction, and that by this example: I wolde subtracte 2892 out of 8746. These summes must I set downe as I dyd in Addition: but here it is best [*116a (_sic_).] to set the lesser no{m}ber fyrste, thus.