Alright, let's work through 4381 times 2835 step by step
4381 × 2835 = 2835 × (4381)
+ 2835 × 1 that equals 2835
+ 2835 × 80 that results in 226800
+ 2835 × 300 that results in 850500
+ 2835 × 4000 producing 11340000

= 12420135
