670 * 200 − 52800 : 40 = 134000 − 1320 = 132680
1) $\snippet{name: column_multiplication, x: 67, y: 2}$;
2) $\snippet{name: long_division, x: 52800, y: 40}$;
3) $\snippet{name: op_column, sign: '-', x: '134000', y: '1320', z: '132680'}$.
 
657450 : 90 + 83 * 600 = 7305 + 49800 = 57105
1) $\snippet{name: long_division, x: 657450, y: 90}$;
2) $\snippet{name: column_multiplication, x: 83, y: 6}$;
3) $\snippet{name: op_column, sign: '+', x: '7305', y: '49800', z: '57105'}$.
 
(612237 − 240037) : 40 = 372200 : 40 = 9305
1) $\snippet{name: op_column, sign: '-', x: '612237', y: '240037', z: '372200'}$;
2) $\snippet{name: long_division, x: 372200, y: 40}$.
 
70 * (100100 − 99800) = 70 * 300 = 21000
1) $\snippet{name: op_column, sign: '-', x: '100100', y: '99800', z: '300'}$;
2) 70 * 300 = 21000.