Alright, let's work through 3631 times 3135 step by step
3631 × 3135 = 3135 × (3631)
+ 3135 × 1 producing 3135
+ 3135 × 30 giving us 94050
+ 3135 × 600 producing 1881000
+ 3135 × 3000 that is equal 9405000

= 11383185
