0,4 * 2,55 * 1,6 = 1,02 * 1,6 = 1,632
1) $\snippet{name: column_multiplication, x: 0.4, y: 2.55}$;
2) $\snippet{name: column_multiplication, x: 1.02, y: 1.6}$.

40 * (7,85 − 3,9) = 3,95 * 40 = 158
1) $\snippet{name: op_column, sign: '+', x: '7,85', y: '3,90', z: '3,95'}$;
2) $\snippet{name: column_multiplication, x: 3.95, y: 4}$.

17 − 3,44 * 3,5 = 17 − 12,04 = 4,96
1) $\snippet{name: column_multiplication, x: 3.44, y: 3.5}$;
2) $\snippet{name: op_column, sign: '-', x: '17,00', y: '12,04', z: '4,96'}$.

(8,4 + 1,92) * (1,7 − 1,5) = 10,32 * 0,2 = 2,064
1) $\snippet{name: op_column, sign: '+', x: '8,40', y: '1,95', z: '10,32'}$;
2) $\snippet{name: op_column, sign: '-', x: '1,7', y: '1,5', z: '0,2'}$;
3) $\snippet{name: column_multiplication, x: 10.32, y: 0.2}$.

17,5 − 3 * 4,5 − 1,725 = 17,5 − 13,5 − 1,725 = 4 − 1,725 = 2,275
1) $\snippet{name: column_multiplication, x: 4.5, y: 3}$;
2) $\snippet{name: op_column, sign: '-', x: '17,5', y: '13,5', z: '4,0'}$;
3) $\snippet{name: op_column, sign: '-', x: '4,000', y: '1,725', z: '2,275'}$;.

20,3 − 5 * (2,4 + 0,43) = 20,3 − 5 * 2,83 = 20,3 − 14,54 = 6,15
1) $\snippet{name: op_column, sign: '+', x: '2,40', y: '0,43', z: '2,83'}$;
2) $\snippet{name: column_multiplication, x: 2.83, y: 5}$;
3) $\snippet{name: op_column, sign: '-', x: '20,30', y: '14,15', z: '6,15'}$.