79 * (5 * 2) = 79 * 10 = 790 − удобный способ;
79 * (5 * 2) = (79 * 5) * 2 = 395 * 2 = 790;
$\snippet{name: column_multiplication, x: 79, y: 5}$
 
$\snippet{name: column_multiplication, x: 395, y: 2}$
 
79 * (5 * 2) = (79 * 2) * 5 = 158 * 5 = 790.
 
54 * (3 * 2) = 54 * 6 = 324 − удобный способ;
$\snippet{name: column_multiplication, x: 54, y: 6}$
54 * (3 * 2) = (54 * 3) * 2 = 162 * 2 = 324;
$\snippet{name: column_multiplication, x: 54, y: 3}$
 
$\snippet{name: column_multiplication, x: 162, y: 2}$
 
54 * (3 * 2) = (54 * 2) * 3 = 108 * 3 = 324.
$\snippet{name: column_multiplication, x: 54, y: 2}$
 
$\snippet{name: column_multiplication, x: 108, y: 3}$
 
163 * (2 * 4) = 163 * 8 = 1304 − удобный способ;
$\snippet{name: column_multiplication, x: 163, y: 8}$
163 * (2 * 4) = (163 * 2) * 4 = 326 * 4 = 1304;
$\snippet{name: column_multiplication, x: 163, y: 2}$
 
$\snippet{name: column_multiplication, x: 326, y: 4}$
 
163 * (2 * 4) = (163 * 4) * 2 = 652 * 2 = 1304.
$\snippet{name: column_multiplication, x: 163, y: 4}$
 
$\snippet{name: column_multiplication, x: 652, y: 2}$