$602 \overset{3}{-} (514 \overset{1}{-} 72) \overset{4}{+} (825 \overset{2}{-} 638) = 602 - 442 + 187 = 160 + 187 = 347$
1)
$\snippet{name: op_column, sign: '-', x: '514', y: '72', z: '442'}$
2)
$\snippet{name: op_column, sign: '-', x: '825', y: '638', z: '187'}$
3)
$\snippet{name: op_column, sign: '-', x: '602', y: '442', z: '160'}$
4)
$\snippet{name: op_column, sign: '+', x: '160', y: '187', z: '347'}$
 
$(216 \overset{1}{+} 84) \overset{3}{-} (740 \overset{2}{-} 593) \overset{4}{+} 689 = 300 - 147 + 689 = 153 + 689 = 842$
1)
$\snippet{name: op_column, sign: '+', x: '216', y: '84', z: '300'}$
2)
$\snippet{name: op_column, sign: '-', x: '740', y: '593', z: '147'}$
3)
$\snippet{name: op_column, sign: '-', x: '300', y: '147', z: '153'}$
4)
$\snippet{name: op_column, sign: '+', x: '153', y: '689', z: '842'}$