600 \overset{2}{−} (75 \overset{1}{+} 147) = 600 − 222 = 378
$\snippet{name: op_column, sign: '+', x: '147', y: '75', z: '222'}$
$\snippet{name: op_column, sign: '-', x: '600', y: '222', z: '378'}$
(600 \overset{1}{−} 75) \overset{2}{+} 147 = 525 + 147 = 672
$\snippet{name: op_column, sign: '-', x: '600', y: '75', z: '525'}$
$\snippet{name: op_column, sign: '+', x: '525', y: '147', z: '672'}$
378 ≠ 672

$702 \overset{2}{-} (374 \overset{1}{-} 29) \overset{3}{+} 168 = 702 - 345 + 168 = 357 + 168 = 525$
$\snippet{name: op_column, sign: '-', x: '374', y: '29', z: '345'}$
$\snippet{name: op_column, sign: '-', x: '702', y: '345', z: '357'}$
$\snippet{name: op_column, sign: '+', x: '357', y: '168', z: '525'}$
$(702 \overset{1}{-} 374) \overset{3}{-} (29 \overset{2}{+} 168) = 328 - 197 = 131$
525 ≠ 131
$\snippet{name: op_column, sign: '-', x: '702', y: '374', z: '328'}$
$\snippet{name: op_column, sign: '+', x: '168', y: '29', z: '197'}$
$\snippet{name: op_column, sign: '-', x: '328', y: '197', z: '131'}$