30000 : 100 * 1000 = 300 * 1000 = 300000
 
30000 : 1000 * 100 = 30 * 100 = 3000
 
286 * 2 − 192 : 3 = 572 − 64 = 508
$\snippet{name: column_multiplication, x: 286, y: 2}$
 
$\snippet{name: long_division, x: 192, y: 3}$
 
$\snippet{name: op_column, sign: '-', x: 572, y: 64, z: 508}$
 
805 : 5 + 228 : 4 = 161 + 57 = 218
$\snippet{name: long_division, x: 805, y: 5}$
 
$\snippet{name: long_division, x: 228, y: 4}$
 
$\snippet{name: op_column, sign: '+', x: 161, y: 57, z: 218}$
 
140100 : 100 = 1401
 
140100 − 100 = 140000.