Xo oo o o oo°
o°o oo°o o o
o°oo°o oo°
o°o o oo° °

Fyrst adde two of them, and then adde the thyrde, and ye 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. 122 b. *And then I adde the thyrde thereto thus.

Xoo°o o o°
o o oo°o o oo o o
o°o o o °o °
o °o°

And so of more yf you haue them.

Subtraction on the Counting Board.

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 Subtraction. 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 116 a (sic). *to set the lesser nomber fyrste, thus.

Xo oo o°o
o°o oo°o
o°o o oo o o o
o oo°

Then shall I begynne to subtracte the greatest nombres fyrste (contrary to the vse of the penne) yt is the thousandes in this example: therfore I fynd amongest the thousandes 2, for which I withdrawe so many from the seconde summe (where are 8) and so remayneth there 6, as this example showeth.

o°
+o°o oo°o
o°o o oo o o o
o oo°