252 : 9 * 6 : 4 = 28 * 6 : 4 = 168 : 4 = 42
$\snippet{name: long_division, x: 252, y: 9}$
 
$\snippet{name: column_multiplication, x: 28, y: 6}$
 
$\snippet{name: long_division, x: 168, y: 4}$
 
144 * 5 : 8 : 30 = 720 : 8 : 30 = 90 : 30 = 3
$\snippet{name: column_multiplication, x: 144, y: 5}$
 
$\snippet{name: long_division, x: 720, y: 8}$
 
90 : 30 = 3
 
27 * 6 − 76 : 19 + 30 = 162 − 4 + 30 = 158 + 30 = 188
$\snippet{name: column_multiplication, x: 27, y: 6}$
 
76 : 19 = 4
 
162 − 4 = 158
 
158 + 30 = 188
 
154 : 7 − (64 + 36) : 25 = 22 − 100 : 25 = 22 − 4 = 18
$\snippet{name: long_division, x: 154, y: 7}$
 
64 + 36 = 100
 
100 : 25 = 4
 
22 − 4 = 18