Alright, let's work through 3311 times 3915 step by step
3311 × 3915 = 3915 × (3311)
+ 3915 × 1 producing 3915
+ 3915 × 10 giving us 39150
+ 3915 × 300 yielding 1174500
+ 3915 × 3000 yielding 11745000

= 12962565
