$703 \overset{3}{-} 21 \overset{2}{*} (361 \overset{1}{-} 349) = 703 - 21 * 12 = 703 - 252 = 451$
1) $\snippet{name: op_column, sign: '-', x: '361', y: '349', z: '12'}$;
2) $\snippet{name: column_multiplication, x: 21, y: 12}$;
3) $\snippet{name: op_column, sign: '-', x: '703', y: '252', z: '451'}$.

$2346 \overset{2}{:} (209 \overset{1}{-} 186) \overset{3}{*} 15 = 2346 : 23 * 15 = 102 * 15 = 1530$
1) $\snippet{name: op_column, sign: '-', x: '209', y: '186', z: '23'}$;
2) $\snippet{name: long_division, x: 2346, y: 23}$;
3) $\snippet{name: column_multiplication, x: 102, y: 15}$.

$77 \overset{2}{*} (452 \overset{1}{-} 348) \overset{3}{-} 99 = 77 * 104 - 99 = 8008 - 99 = 7909$
1) $\snippet{name: op_column, sign: '-', x: '452', y: '348', z: '104'}$;
2) $\snippet{name: column_multiplication, x: 104, y: 77}$;
3) $\snippet{name: op_column, sign: '-', x: '8008', y: '99', z: '7909'}$.

$874 \overset{3}{-} (27 \overset{1}{*} 90 \overset{2}{-} 1999) = 874 - (2430 - 1999) = 874 - 431 = 443$
1) $\snippet{name: column_multiplication, x: 27, y: 90}$;
2) $\snippet{name: op_column, sign: '-', x: '2430', y: '1999', z: '431'}$;
3) $\snippet{name: op_column, sign: '-', x: '874', y: '431', z: '443'}$.