$3 * 4^2 - 6^3 : 12 = 3 * 16 - 216 : 12 = 48 - 18 = 30$

Вычисления:
$\snippet{name: column_multiplication, x: 16, y: 3}$

$\snippet{name: column_multiplication, x: 36, y: 6}$

$\snippet{name: long_division, x: 216, y: 12}$