604 − 287 = 317
$\snippet{name: op_column, sign: '-', x: '604', y: '287', z: '317'}$
 
605 − 287 = 318;
604 − 288 = 316;
605 − 288 = 317;
704 − 387 = 317.

529 + 185 = 714
$\snippet{name: op_column, sign: '+', x: '529', y: '185', z: '714'}$
 
530 + 185 = 715;
529 + 186 = 715;
530 + 184 = 714;
629 + 285 = 914.