$215 \overset{2}{-} (38 \overset{1}{+} 169) = 215 - 207 = 8$
$\snippet{name: op_column, sign: '+', x: '169', y: '38', z: '207'}$
$\snippet{name: op_column, sign: '-', x: '215', y: '207', z: '8'}$
 
$(354 \overset{1}{+} 97) \overset{2}{-} 263 = 451 - 263 = 188$
$\snippet{name: op_column, sign: '+', x: '354', y: '97', z: '451'}$
$\snippet{name: op_column, sign: '-', x: '451', y: '263', z: '188'}$
 
$500 \overset{2}{-} (239 \overset{1}{+} 85) \overset{3}{+} 457 = 500 - 324 + 457 = 176 + 457 = 633$
$\snippet{name: op_column, sign: '+', x: '239', y: '85', z: '324'}$
$\snippet{name: op_column, sign: '-', x: '500', y: '324', z: '176'}$
$\snippet{name: op_column, sign: '+', x: '176', y: '457', z: '633'}$
 
$(304 \overset{1}{-} 26) \overset{3}{-} (72 \overset{2}{+} 168) = 278 - 240 = 38$
$\snippet{name: op_column, sign: '-', x: '304', y: '26', z: '278'}$
$\snippet{name: op_column, sign: '+', x: '168', y: '72', z: '240'}$
$\snippet{name: op_column, sign: '-', x: '278', y: '240', z: '38'}$