704 * 69 + 1424 = 48576 + 1424 = 50000
1) $\snippet{name: column_multiplication, x: 704, y: 69}$
2) $\snippet{name: op_column, sign: '+', x: 48576, y: 1424, z: 50000}$

412 * 42 − 7304 = 17304 − 7304 = 10000
1) $\snippet{name: column_multiplication, x: 412, y: 42}$
2) $\snippet{name: op_column, sign: '-', x: 17304, y: 7304, z: 10000}$

(938 − 543) * 34 = 395 * 34 = 13430
1) $\snippet{name: op_column, sign: '-', x: 938, y: 543, z: 395}$
2) $\snippet{name: column_multiplication, x: 395, y: 34}$

85 * (870 − 567) = 85 * 303 = 25755
1) $\snippet{name: op_column, sign: '-', x: 870, y: 567, z: 303}$
2) $\snippet{name: column_multiplication, x: 85, y: 303}$

(294 + 16) * (348 − 279) = 310 * 69 = 21390
1) $\snippet{name: op_column, sign: '+', x: 294, y: 16, z: 310}$
2) $\snippet{name: op_column, sign: '-', x: 348, y: 279, z: 69}$
3) $\snippet{name: column_multiplication, x: 310, y: 69}$

294 + 16 * 348 − 279 = 294 + 5568 − 279 = 5862 − 279 = 5583
1) $\snippet{name: column_multiplication, x: 16, y: 348}$
2) $\snippet{name: op_column, sign: '+', x: 294, y: 5568, z: 5862}$
3) $\snippet{name: op_column, sign: '-', x: 5862, y: 279, z: 5583}$

(294 + 16) * 348 − 279 = 310 * 348 − 279 = 107880 − 279 = 107601
1) $\snippet{name: op_column, sign: '+', x: 294, y: 16, z: 310}$
2) $\snippet{name: column_multiplication, x: 310, y: 348}$
3) $\snippet{name: op_column, sign: '-', x: 107880, y: 279, z: 107601}$

294 + 16 * (348 − 279) = 294 + 16 * 69 = 294 + 1104 = 1398
1) $\snippet{name: op_column, sign: '-', x: 348, y: 279, z: 69}$
2) $\snippet{name: column_multiplication, x: 16, y: 69}$
3) $\snippet{name: op_column, sign: '+', x: 249, y: 1104, z: 69}$