8000 : (25 * 4) * 7 = 8000 : 100 * 7 = 80 * 7 = 560
 
9000 : (300 : 3) * 6 = 900 : 100 * 6 = 90 * 6 = 540
 
832 − 328 − 247 = 504 − 247 = 257
$\snippet{name: op_column, sign: '-', x: 832, y: 328, z: 504}$
 
$\snippet{name: op_column, sign: '-', x: 504, y: 247, z: 257}$
 
603 − (347 − 189) = 603 − 158 = 445
$\snippet{name: op_column, sign: '-', x: 347, y: 189, z: 158}$
 
$\snippet{name: op_column, sign: '-', x: 603, y: 158, z: 445}$
 
903 − (178 + 359) : 3 = 903 − 537 : 3 = 903 − 179 = 724
$\snippet{name: op_column, sign: '+', x: 178, y: 359, z: 537}$
 
$\snippet{name: long_division, x: 537, y: 3}$
 
$\snippet{name: op_column, sign: '-', x: 903, y: 179, z: 724}$
 
324 + (503 − 299) : 4 = 324 + 204 : 4 = 324 + 51 = 375
$\snippet{name: long_division, x: 537, y: 3}$
 
$\snippet{name: long_division, x: 204, y: 4}$
 
$\snippet{name: long_division, x: 324, y: 51}$