Alright, let's work through 3922 times 5305 step by step
3922 × 5305 = 5305 × (3922)
+ 5305 × 2 which equals 10610
+ 5305 × 20 what gives us 106100
+ 5305 × 900 resulting in 4774500
+ 5305 × 3000 what gives us 15915000

= 20806210
