72960 : 19 = 3840
$\snippet{name: long_division, x: 72960, y: 19}$
 
87220 : 14 = 6230
$\snippet{name: long_division, x: 87220, y: 14}$
 
260 * 403 − (568 * 5 − 1840) = 104780 − (2840 − 1840) = 104780 − 1000 = 103780
1) $\snippet{name: column_multiplication, x: 26, y: 403}$;
2) $\snippet{name: column_multiplication, x: 568, y: 5}$;
3) 2840 − 1840 = 1000;
4) 104780 − 1000 = 103780
 
671 * 223 + (6000 − 87 * 40) = 149633 + (6000 − 3480) = 149633 + 2520 = 152153
1) $\snippet{name: column_multiplication, x: 671, y: 223}$;
2) $\snippet{name: column_multiplication, x: 87, y: 4}$;
3) $\snippet{name: op_column, sign: '-', x: '6000', y: '3480', z: '2520'}$;
4) $\snippet{name: op_column, sign: '+', x: '149633', y: '2520', z: '152153'}$.