154 + 629 = 783
$\snippet{name: op_column, sign: '+', x: '154', y: '629', z: '783}$
783 − 312 = 471
$\snippet{name: op_column, sign: '+', x: '783', y: '312', z: '471'}$
920 − 783 = 137
$\snippet{name: op_column, sign: '-', x: '920', y: '783', z: '137'}$
312 − 154 = 158
$\snippet{name: op_column, sign: '-', x: '312', y: '154', z: '158'}$
920 − 154 = 766
$\snippet{name: op_column, sign: '-', x: '920', y: '154', z: '766'}$
920 − 312 = 608
$\snippet{name: op_column, sign: '-', x: '920', y: '312', z: '608'}$