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manet 0: item 1 a 2, manet 1; item 1 a 3, manet 2. Residuum ergo est numerus I.

Exemplum IV.

K. 284560
L. 65340 7x7

M. 219220
Sit numerus L subtrahendus ex K. Dic, 0 a 0, manet 0: iterum, 4 a 6, manent 2: iterum, 3 a 5, manent 2: iterum, 5 a 14, manent 9: iterum 6 a 7, manet 1: tandem residua 2 scribantur infra, ut vides. Ergo residuum est numerus M.

Exemplum V.

N. 5638
O. 1209 4x4

P. 4429
In hoc exemplo dic: 9 ad 18, remanent 9: item, 0 a 2 (non a 3, quia haec figura fuit minuta una unitate) remanent 2: item, 2 a 6, remanent 4 etc. Itaque residuum est P.

Exemplum VI.

Q. 20309
R. 10172 5x5

S. 10137
In hoc exemplo dic: 2 a 9, manent 7: item, 7 a 10 (accipiendo mutuam unitatem a proxime sequenti figura, quae est 3) remanent 3: item, 1 a 2 (non a 3) remanet 1: item, 0 a 0, remanet 0: eandem, 1 a 2, remanet 1. Residuum est S.

Exemplum VII.

T. 50008
V. 15432 4x4

X. 34576
Dic: 2 ab 8, remanent 6:3 a 10, remanent 7: 4 a 9, remanent 4: 5 a 9, remanent 4: 1 a 4, remanent 3.