(987 − 879) * 6 = 108 * 6 = 648
$\snippet{name: op_column, sign: '-', x: 987, y: 879, z: 108}$
 
$\snippet{name: column_multiplication, x: 108, y: 6}$
 
900 − 139 * 5 = 900 − 695 = 205
$\snippet{name: column_multiplication, x: 139, y: 5}$
 
$\snippet{name: op_column, sign: '-', x: 900, y: 695, z: 205}$
 
2 * (293 + 62) = 2 * 355 = 710
$\snippet{name: op_column, sign: '+', x: 293, y: 62, z: 355}$
 
$\snippet{name: column_multiplication, x: 355, y: 2}$
 
4 * 197 − 189 = 788 − 189 = 599
$\snippet{name: column_multiplication, x: 197, y: 4}$
 
$\snippet{name: op_column, sign: '-', x: 788, y: 189, z: 599}$
 
3 * 242 + 824 * 4 = 726 + 206 = 932
$\snippet{name: column_multiplication, x: 242, y: 3}$
 
$\snippet{name: column_multiplication, x: 824, y: 4}$
 
$\snippet{name: op_column, sign: '+', x: 726, y: 206, z: 932}$
 
(4 * 209 − 228) : 8 = (836 − 228) : 8 = 608 : 8 = 76
$\snippet{name: column_multiplication, x: 209, y: 4}$
 
$\snippet{name: op_column, sign: '-', x: 836, y: 228, z: 608}$
 
$\snippet{name: long_division, x: 608, y: 8}$