So y^t yf I subtracte 2892 fro{m} 8746, the remayner wyll be 5854, [*117b] And that this is truely wrought, you maye proue by Addition: for yf you adde to this remayner the same su{m}me that you dyd subtracte, then wyll the formar su{m}me 8746 amount agayne. _S._ That wyll I proue: and fyrst I set the su{m}me that was subtracted, which was 2892, {and} the{n} the remayner 5854, thus. --------------+-------------- | o -||--o-o------+-------------- o | o -----o-o-o----+--o-o-o------- o | o -----o-o-o-o--+-------------- | -----o-o------+--o-o-o-o----- Then do I adde fyrst y^e 2 to 4, whiche maketh 6, so take I vp 5 of those counters, and in theyr stede I sette 1 in the space, as here appereth. --------------+------------ | o -||--o-o------+------------ o | o -----o-o-o----+--o-o-o----- o | o -----o-o-o-o--+------------ | o --------------+--o--------- [*118a] Then do I adde the 90 nexte aboue to the 50, and it maketh 140, therfore I take vp those 6 counters, and for them I sette 1 to the hundredes in y^e thyrde lyne, {and} 4 in y^e second lyne, thus. ------------+-------------- | o -||--o-o----+-------------- o | o -----o-o-o--+--o-o-o-o----- | ------------+--o-o-o-o----- | o ------------+----o--------- Then do I come to the hundredes, of whiche I fynde 8 in the fyrst summe, and 9 in y^e second, that maketh 1700, therfore I take vp those 9 counters, and in theyr stede I sette 1 in the .iiii. lyne, and 1 in the space nexte beneth, and 2 in the thyrde lyne, as you se here. ----------+-------------- | o -||--o-o--+--o----------- | o ----------+--o-o--------- | ----------+--o-o-o-o----- | o ----------+--o----------- Then is there lefte in the fyrste summe but only 2000, whiche I shall take vp from thence, and set [*118b] in the same lyne in y^e second su{m}me, to y^e one y^t is there all redy: {and} then wyll the hole su{m}me appere (as you may wel se) to be 8746, which was y^e fyrst grosse summe, {and} therfore I do perceaue, that I hadde well subtracted before. And thus you may se how Subtraction maye be tryed by Addition. ----+-------------- | o -X--+--o-o-o------- | o ----+--o-o--------- | ----+--o-o-o-o----- | o ----+----o--------- _S._ I perceaue the same order here w^t cou{n}ters, y^t I lerned before in figures. _M._ Then let me se howe can you trye Addition by Subtraction. _S._ Fyrste I wyl set forth this exa{m}ple of Additio{n} where I haue added 2189 to 4988, and the hole su{m}me appereth to be 7177,