Alright, let's work through 8143 times 3581 step by step
8143 × 3581 = 3581 × (8143)
+ 3581 × 3 that is equal 10743
+ 3581 × 40 which equals 143240
+ 3581 × 100 giving us 358100
+ 3581 × 8000 which equals 28648000

= 29160083
