19999 + 1 = 20000
 
80000 − 1 = 79999
 
178 * 35 = 6230
$\snippet{name: column_multiplication, x: 178, y: 35}$
 
516 : 12 = 43
$\snippet{name: long_division, x: 516, y: 12}$
 
6900 − 912 : 38 * 5 = 6900 − 24 * 5 = 6900 − 120 = 6780
1) $\snippet{name: long_division, x: 912, y: 38}$;
2) $\snippet{name: column_multiplication, x: 24, y: 5}$;
3) $\snippet{name: op_column, sign: '-', x: '6900', y: '120', z: '6780'}$.
 
4050 : 50 * 14 − 34 = 405 : 5 * 14 − 34 = 81 * 14 − 34 = 1134 − 34 = 1100
1) $\snippet{name: long_division, x: 405, y: 5}$;
2) $\snippet{name: column_multiplication, x: 81, y: 14}$;
3) 1134 − 34 = 1100.