Alright, let's work through 3509 times 5135 step by step
3509 × 5135 = 5135 × (3509)
+ 5135 × 9 resulting in 46215
+ 5135 × 00 that is equal 0
+ 5135 × 500 which equals 2567500
+ 5135 × 3000 that is equal 15405000

= 18018715
