(531 : 9 + 172) * 3 = (59 + 172) * 3 = 231 * 3 = 693
1) $\snippet{name: long_division, x: 531, y: 9}$
2) $\snippet{name: op_column, sign: '+', x: '59', y: '172', z: '231'}$
3) $\snippet{name: column_multiplication, x: 231, y: 3}$
 
870 : (9 * 36 − 295) = 870 : (324 − 295) = 870 : 29 = 30
1) $\snippet{name: column_multiplication, x: 36, y: 9}$
2) $\snippet{name: op_column, sign: '-', x: '324', y: '295', z: '29'}$
3) $\snippet{name: long_division, x: 870, y: 29}$
 
960 : 4 + 294 : (1004 − 962) = 240 + 294 : 42 = 240 + 7 = 247
1) $\snippet{name: op_column, sign: '-', x: '1004', y: '962', z: '42'}$
2) $\snippet{name: long_division, x: 960, y: 4}$
3) $\snippet{name: long_division, x: 294, y: 42}$
4) $\snippet{name: op_column, sign: '+', x: '240', y: '7', z: '247'}$
 
450 : 5 − (630 : 7 − 810 : 9) = 90 − (90 − 90) = 90 − 0 = 90