$\snippet{name: column_multiplication, x: 345, y: 2}$
 
$\snippet{name: op_column, sign: '+', x: '354', y: '96', z: '450'}$
 
$\snippet{name: op_column, sign: '+', x: '50', y: '124', z: '174'}$
 
84 : 12 * 7 = 7 * 7 = 49