720 * 9 − 385 : 5 * (1029 − 980) = 6480 − 77 * 49 = 6480 − 3773 = 2707
1) $\snippet{name: op_column, sign: '-', x: '1029', y: '980', z: '49'}$;
2) $\snippet{name: column_multiplication, x: 720, y: 9}$;
3) $\snippet{name: long_division, x: 385, y: 5}$;
4) $\snippet{name: column_multiplication, x: 77, y: 49}$;
5) $\snippet{name: op_column, sign: '-', x: '6480', y: '3773', z: '2707'}$.
 
(811 + 4189) : 1000 * 317 − 600 = 5000 : 1000 * 317 − 600 = 5 * 317 − 600 = 1585 − 600 = 985
1) $\snippet{name: op_column, sign: '+', x: '4189', y: '811', z: '5000'}$;
2) 5000 : 1000 = 5;
3) $\snippet{name: column_multiplication, x: 317, y: 5}$;
4) $\snippet{name: op_column, sign: '-', x: '1585', y: '600', z: '985'}$.
 
3100 : (67 * 28 − 592 * 3) + 2599 = 3100 : (1876 − 1776) + 2599 = 3100 : 100 + 2599 = 31 + 2599 = 2630
1) $\snippet{name: column_multiplication, x: 67, y: 28}$;
2) $\snippet{name: column_multiplication, x: 592, y: 3}$;
3) 1876 − 1776 = 100;
4) 3100 : 100 = 31;
5) 31 + 2599 = 2630.
 
371 * 50 − 8 * (42 * 100 − 616 * 4) = 18550 − 8 * (4200 − 2464) = 18550 − 8 * 1736 = 18550 − 13888 = 4662
1) 42 * 100 = 4200;
2) $\snippet{name: column_multiplication, x: 616, y: 4}$;
3) $\snippet{name: op_column, sign: '-', x: '4200', y: '2464', z: '1736'}$;
4) $\snippet{name: column_multiplication, x: 371, y: 50}$;
5) $\snippet{name: column_multiplication, x: 1736, y: 8}$;
6) $\snippet{name: op_column, sign: '-', x: '18550', y: '13888', z: '4662'}$.
 
(95 * 63 − 94 * 56 + 279) : 1000 = (5985 − 5264 + 279) : 1000 = (721 + 279) : 1000 = 1000 : 1000 = 1
1) $\snippet{name: column_multiplication, x: 95, y: 63}$;
2) $\snippet{name: column_multiplication, x: 94, y: 56}$;
3) $\snippet{name: op_column, sign: '-', x: '5985', y: '5264', z: '721'}$;
4) $\snippet{name: op_column, sign: '+', x: '721', y: '279', z: '1000'}$;
5) 1000 : 1000 = 1.
 
(53040 − 52584) * 90 + 58960 = 456 * 90 + 58960 = 41040 + 58960 = 100000
1) $\snippet{name: op_column, sign: '-', x: '53040', y: '52584', z: '456'}$;
2) $\snippet{name: column_multiplication, x: 456, y: 90}$;
3) $\snippet{name: op_column, sign: '+', x: '41040', y: '58960', z: '100000'}$.