108 * 7 : 9 + 164 * 4 = 756 : 9 + 656 = 84 + 656 = 740
1) $\snippet{name: column_multiplication, x: 108, y: 7}$
2) $\snippet{name: long_division, x: 756, y: 9}$
3) $\snippet{name: column_multiplication, x: 164, y: 4}$
4) $\snippet{name: op_column, sign: '+', x: '84', y: '656', z: '740'}$
 
143 * 4 − (115 * 8 − 569) = 572 − (920 − 569) = 572 − 351 = 221
1) $\snippet{name: column_multiplication, x: 115, y: 8}$
2) $\snippet{name: op_column, sign: '-', x: '920', y: '569', z: '351'}$
3) $\snippet{name: column_multiplication, x: 143, y: 4}$
4) $\snippet{name: op_column, sign: '-', x: '572', y: '351', z: '221'}$
 
915 − (144 * 3 : 6 + 548) = 915 − (432 : 6 + 548) = 915 − (72 + 548) = 915 − 620 = 295
1) $\snippet{name: column_multiplication, x: 144, y: 3}$
2) $\snippet{name: long_division, x: 432, y: 6}$
3) $\snippet{name: op_column, sign: '+', x: '72', y: '548', z: '620'}$
4) $\snippet{name: op_column, sign: '-', x: '915', y: '620', z: '295'}$
 
(159 * 5 − 612) : 3 * 14 = (795 − 612) : 3 * 14 = 183 : 3 * 14 = 61 * 14 = 854
1) $\snippet{name: column_multiplication, x: 159, y: 5}$
2) $\snippet{name: op_column, sign: '-', x: '795', y: '612', z: '183'}$
3) $\snippet{name: long_division, x: 183, y: 3}$
4) $\snippet{name: column_multiplication, x: 61, y: 14}$