312 : 4 * 9 − 480 : 16 * 5 = 78 * 9 − 30 * 5 = 702 − 150 = 552
1) $\snippet{name: long_division, x: 312, y: 4}$;
2) $\snippet{name: column_multiplication, x: 72, y: 9}$;
3) $\snippet{name: long_division, x: 480, y: 16}$;
4) 30 * 5 = 1504;
5) $\snippet{name: op_column, sign: '-', x: '702', y: '150', z: '552'}$.
 
900 : 5 : 4 + 117 * 7 : 3 = 180 : 4 + 819 : 3 = 45 + 273 = 318
1) $\snippet{name: long_division, x: 900, y: 5}$;
2) $\snippet{name: long_division, x: 180, y: 4}$;
3) $\snippet{name: column_multiplication, x: 117, y: 7}$;
4) $\snippet{name: long_division, x: 819, y: 3}$;
5) $\snippet{name: op_column, sign: '+', x: '45', y: '273', z: '318'}$.
 
12000 − (18 * 54 + 1048) = 12000 − (972 + 1048) = 12000 − 2020 = 9980
1) $\snippet{name: column_multiplication, x: 18, y: 54}$;
2) $\snippet{name: op_column, sign: '+', x: '972', y: '1048', z: '2020'}$;
3) $\snippet{name: op_column, sign: '-', x: '1200', y: '2020', z: '9980'}$.
 
7150 − 800 * (375 : 75) = 7150 − 800 * 5 = 7150 − 4000 = 3150
1) $\snippet{name: long_division, x: 375, y: 75}$;
2) 800 * 5 = 4000;
3) 7150 − 4000 = 3150.