a + 138
0 + 138 = 138
5 + 138 = 143
42 + 138 = 180
$\snippet{name: op_column, sign: '+', x: '138', y: '42', z: '180'}$
56 + 138 = 194
$\snippet{name: op_column, sign: '+', x: '138', y: '56', z: '194'}$
79 + 138 = 217
$\snippet{name: op_column, sign: '+', x: '138', y: '79', z: '217'}$
308 + 138 = 446
$\snippet{name: op_column, sign: '+', x: '308', y: '138', z: '446'}$
587 + 138 = 725
$\snippet{name: op_column, sign: '+', x: '587', y: '138', z: '725'}$

 
b − 194
194 − 194 = 0
198 − 194 = 4
200 − 194 = 6
397 − 194 = 203
$\snippet{name: op_column, sign: '-', x: '397', y: '194', z: '203'}$
425 − 194 = 231
$\snippet{name: op_column, sign: '-', x: '425', y: '194', z: '231'}$
581 − 194 = 387
$\snippet{name: op_column, sign: '-', x: '581', y: '194', z: '387'}$
903 − 194 = 709
$\snippet{name: op_column, sign: '-', x: '9030', y: '194', z: '709'}$